Patent Description:
In the prior art, the <CIT> discloses a trigger assembly which is positioned within the frame of the weapon by proud and recessed surfaces and fixed by pins or bolts. This makes it impossible to change the trigger assembly without tools and especially in the field.

The <CIT> discloses to mount a trigger assembly with pins; positioning elements are not mentioned at all. The same is true for the <CIT>, the <CIT>, the <CIT>, the <CIT> and the <CIT>, too.

The invention and its variants are not limited to use in rifles, carbines, etc., but can, in principle, also be used in certain pistols. The improvements achieved and the effects/advantages of these improvements are stated below. Since such trigger units can be used interchangeably as a module in existing weapons and the weapons themselves only provide the geometric and functional boundaries for their use, the invention primarily relates to a trigger unit and only secondarily to a weapon having such a trigger unit.

A modem trigger unit should generally be easy to use, reliable, easy to maintain and, by means of a fire-control/safety selector, should be adjustable between a "safe" state and at least one "unlocked" or "fire" state. A large number of such trigger units have a construction which prevents the selector from being adjusted to the "safe" position when the hammer is in the behind or downward position. This is often due to the fact that the trigger lever, which includes a sear that interacts with the fire-control/safety selector (also often referred to as a safety lever), the trigger and the hammer (also referred to as a striking piece), is designed in one piece. Examples are <CIT>, <CIT>, and <CIT>, from which these relationships can be seen very clearly.

Reference is also made to <CIT>, which discloses a modular hammer-trigger system in which, as can be seen particularly well in <FIG>, both a disconnector and a sear are rotatable mounted in recesses of the trigger and are biased by means of springs. The hammer and trigger can be rotated in a common module by means of needle bearings and are also biased by means of springs. The various springs, the requirement for the spring to fit in very small spaces, and the tight geometric dependencies required to fulfill the individual functions of the springs are problematic, even if one assumes that maintenance only takes place in an armory and/or with the use of special tools.

Another common concern is the shooter's interest in having a trigger unit that requires a two-stage build-up of resistance until the shot is fired. These trigger resistances should be perceived and distinguishable by the shooter when the trigger is operated. Here, too, a large number of two-stage trigger units are known to have a first trigger pull resistance (e.g. "pre-trigger resistance") and a second trigger pull resistance (e.g. "main trigger resistance"). Overcoming the first and second trigger resistances is often referred to in English as the "first stage" and the "second stage. " The previously cited <CIT>, and <CIT>, should be mentioned as representative of the many different design options for two-stage trigger units since very different components are responsible for their operation.

The content of <CIT>, <CIT>, <CIT>, <CIT>, <CIT> and <CIT> all disclose state of the art trigger units.

The object of the present invention is therefore to provide a trigger unit which enables the firearm to be secured with the fire-control/safety selector able to turn to the "safe" position when the hammer is in the behind or downward position. Another object of the invention is, with at least one embodiment, a two-stage or three-stage trigger unit with different trigger resistances are provided.

In addition, a further object of the present invention is to provide a fire-control/safety selector that is easy to use and, if necessary, easy to replace.

Furthermore, the object of the present invention is to keep the total number of components of a trigger assembly as low as possible and preferably to make their arrangement in the receiver of a firearm as positionally stable and as easy to replace as possible.

Furthermore, according to the invention there is provided a trigger unit that is easy to handle, easy to maintain and relatively easy to replace as a modular "drop-in" trigger unit.

The first-mentioned object of the invention is achieved by a trigger unit as explained below. The trigger unit comprises a hammer that is rotatable mounted about a hammer axis and can be biased by means of a hammer spring, wherein the hammer spring has a first arm and a second arm, a trigger lever that is rotatable mounted about a trigger axis and which, preferably integrally formed with it, has a trigger that, when viewed in a normal direction, lies below the trigger axis and is moved against a running direction when the trigger unit is actuated, wherein the trigger lever has a trigger rear part that is designed to accommodate at least one disconnector, as well as a sear rotatable mounted about a sear axis and can be biased by means of a sear spring, wherein the hammer axis, the trigger axis and the sear axis are arranged parallel to one another and parallel to a transverse direction. The trigger lever has a recess and the sear is at least partially arranged within the recess of the trigger lever so that the sear axis and the trigger axis coincide, and the sear has a bearing on its upper side for receiving and limiting rotation around a disconnector axis of a disconnector joint formed on the underside of the disconnector. In addition, the bearing is designed to at least partially surround the disconnector joint in the direction of rotation about the disconnector axis.

In other words, the sear and the trigger lever have a common axis of rotation, such that the sear axis and the trigger axis coincide. The sear has a bearing on its upper side for receiving and limiting rotation about a disconnector axis of a disconnector joint formed on the underside of the disconnector, and the bearing for the disconnector joint is at least partially designed to enclose the disconnector axis in the direction of rotation. In this way, the hammer, which is rotatable mounted about the hammer axis and can be biased by means of a hammer spring, is no longer blocked by the trigger when it is in the behind or downward position.

The trigger lever, which is mounted rotatable about the trigger axis, comprises an integral trigger and a trigger rear part that is designed to accommodate the disconnector, or at least one disconnector. The inventive design and arrangement, and the interaction of the sear, disconnector and trigger lever, allow for the adjustment of the fire-control/safety selector when the hammer is in the behind or downward position to the "safe" position, since the rear part of the trigger can be easily deflected in this state. The bearing and the disconnector joint are designed to be substantially complementary to one another in terms of shape and function in order to allow a rotation around the disconnector axis within limits. The assembly can be carried out simply by pushing together laterally, as is explained in more detail in the description of the figures. In the installed condition, this also prevents the components of the trigger unit from being lost.

The present description includes further inventive aspects relating to, among other things, differently designed trigger units, in particular a modular "drop-in" trigger unit, a "pull-through" trigger unit, and housing components for receiving these trigger units, as well as the design of fire-control/safety selectors. These aspects can possibly be viewed as independent inventions and thus form the basis of our own patents independently of one another. For the sake of simplicity and clarity, they are explained in detail using the following description of the figures.

The invention is explained in more detail in the following with reference to the drawings, in which:.

The terms left, right, top, bottom, front and rear always refer to the shooter's view in the firing direction of the firearm when it is held in a ready to fire position. The weapon has, going through the barrel axis and oriented vertically, a weapon center plane, which forms a plane of symmetry.

In the description and the claims, the terms "front," "rear," "above," "below" and so on are used in the generally accepted form and with reference to the object in its usual use position. This means that, for the firearm, the mouth (also referred to as the muzzle) of the barrel is "at the front," and that the breech is moved "rearward" by the force of explosive gas, etc. Transverse to a direction substantially means a direction of rotation by <NUM>°.

In the figures described below, the barrel direction (e.g. towards the mouth/muzzle of the barrel) is indicated by arrow <NUM>, the normal direction upward with arrow <NUM> and the transverse direction to the left with arrow <NUM>.

In <FIG>, a firearm with barrel <NUM>, grip <NUM>, magazine <NUM>, stock <NUM>, handguard <NUM>, trigger as part of the trigger unit <NUM>, fire-control/safety selector <NUM> and receiver <NUM>, which comprises an upper receiver part <NUM> and a lower receiver part <NUM>, is shown schematically and includes the dashed line designating the bore axis <NUM> as well as the direction of movement forward with arrow <NUM> and normal direction upward with arrow <NUM>.

<FIG> shows a schematic exploded view of an exemplary embodiment of a trigger according to the invention. As shown, the trigger is preferably designed as a trigger unit <NUM> (<FIG>) with a trigger housing <NUM>. The dashed lines indicate the arrangement of the components for the trigger unit <NUM> (<FIG>) for assembly.

The trigger comprises at least one hammer <NUM>, a trigger bar <NUM>, a trigger rear <NUM>, a sear <NUM>, and a disconnector <NUM>. In a preferred embodiment, which is described below, the trigger according to the invention is arranged in a trigger housing <NUM> and is referred to as a trigger unit <NUM> (<FIG>). However, it is also possible to arrange the trigger directly in a receiver <NUM> (<FIG>) of a firearm, preferably in a lower receiver part <NUM> (<FIG>), without a trigger housing <NUM>.

As is often the case, the hammer <NUM> is rotatable supported by a hammer pin <NUM> about the hammer axis <NUM> and protrudes partially upward out of the trigger housing <NUM> in the normal direction <NUM> and, as described further below, is biased by the hammer spring <NUM>.

The trigger lever <NUM> is rotatable mounted about the trigger axis <NUM>, for example by means of a trigger pin <NUM> in the trigger housing <NUM>, wherein the trigger axis <NUM> is arranged behind the hammer axis <NUM> when viewed in the barrel direction <NUM> to the front.

The mechanical engagement on the hammer <NUM> or its hammer cam <NUM> (in the prior art often also referred to as a trigger catch on the hammer or hammer catch, see also, for example, <FIG> and <FIG>) does not take place directly with the trigger lever <NUM> - as known in the prior art - but indirectly, via the separately designed sear <NUM>, which has a sear edge <NUM> (also called a trigger sear, see also, for example, <FIG> and <FIG>). According to the invention, the sear <NUM> and the trigger lever <NUM> have a common axis of rotation in the installed condition, which is accordingly referred to as both the trigger axis <NUM> and the sear axis <NUM>.

In addition, the sear <NUM> is connected to a disconnector <NUM> according to the invention in that the sear <NUM> has a bearing <NUM> on its upper side for receiving a disconnector joint <NUM> formed on the underside of the disconnector <NUM>. The bearing <NUM> surrounds the disconnector joint <NUM> at least partially (preferably to over <NUM>°) in the direction of rotation about the disconnector axis <NUM>, which runs in the transverse direction <NUM> through the disconnector joint <NUM>. In the installed condition, this allows a limited rotation of the disconnector <NUM> about the disconnector axis <NUM> and, due to the formation of the common sear axis <NUM> and trigger axis <NUM>, the sear <NUM> and the disconnector <NUM> can be tilted or rotated within limits, both individually and together. The sear <NUM> and the disconnector <NUM> are preferably at least partially received by the trigger lever <NUM>, which, as shown, is then divided in the form of a recess.

A sear spring <NUM> which is essentially U-shaped when viewed from above and approximately L-shaped when viewed from the side is also arranged on both sides of the trigger lever <NUM>, each having one or more turns in the kink areas of the "L. " The sear spring <NUM> is held in the trigger unit <NUM> (<FIG>) by the trigger pin <NUM>, which protrudes through the windings. The leg of the sear spring <NUM>, which is at the rear in the installed condition, engages the underside of the trigger housing <NUM> in the illustrated embodiment; see also <FIG>, for example. This type of spring support can also be achieved by a person skilled in the art in a different manner, for example by means of corresponding support points on the inside of a firearm's lower receiver <NUM> (<FIG>). However, according to the invention, the two loose ends of the sear spring <NUM> are supported on the sear <NUM> on sear spring supports <NUM> (<FIG>) provided on the underside thereof. These points of application are "in front of" the sear axis <NUM>. As a result, a sear edge <NUM> (<FIG>) at the front end of the sear <NUM> is biased upward, in the direction of the hammer <NUM>.

The hammer spring <NUM> comprises a first arm <NUM>, a first spiral (screw winding), a central and essentially U-shaped connecting piece, a second spiral, and a second arm <NUM> (see <FIG>). The first arm <NUM> and the second arm <NUM> are not designed, as is often the case in the prior art, arranged parallel to one another, but preferably, as shown, at an angle to one another (projected into the weapon's center plane, to which the axis of the spirals are at least approximately normal).

The hammer <NUM> is biased in the installed condition by means of the hammer spring <NUM>. The hammer spring <NUM> is tensioned in the usual way with the central connecting piece of the hammer spring <NUM> from below against the hammer <NUM>, and the first arm <NUM> can be counter-supported by the trigger pin <NUM>, for example. In the embodiment shown, as can be seen from viewing <FIG> together with <FIG>, a laterally protruding hammer spring support <NUM> can be provided on the trigger lever <NUM> which acts as an abutment for the first arm <NUM> of the hammer spring <NUM>, whereby an abutment of the hammer spring <NUM> against the sear spring <NUM> can be avoided. This support of the hammer spring <NUM> on the hammer spring support <NUM>, which is preferred according to the invention, also results in a force transmission which presses the trigger lever <NUM> with its trigger rear <NUM> downward in the normal direction <NUM>. This relationship is advantageous for the design of the trigger unit <NUM> (<FIG>) according to the invention, since it transmits a force to be overcome on the trigger lever <NUM> and thus noticeably for the shooter on the trigger bar <NUM>, which is perceived as the first trigger stage <NUM> position (<FIG>) (often referred to as the "first stage" in English) and defines the resistance in the idle tension, which will be explained later.

The second arm <NUM> of the hammer spring <NUM>, which, as is difficult to see in <FIG>, protrudes obliquely forward, can be supported on a spring seat <NUM>, which is formed on the leg <NUM> of an auto sear <NUM> below the auto sear axis <NUM>. In the exemplary embodiment shown, the auto sear <NUM> is rotatable mounted around the auto sear axis <NUM> in the trigger housing <NUM> by means of the auto sear pin <NUM>, wherein the auto sear axis <NUM> is arranged "in front of" the hammer axis <NUM>. The auto sear <NUM> comprises a top <NUM> protruding upward from the trigger housing <NUM> in the normal direction <NUM>, an auto sear edge <NUM> (see also <FIG>) and a hammer stop <NUM>. The spring bias of the hammer spring <NUM> pushes the top <NUM> of the auto sear <NUM> backward; in the installed condition (e.g. in the locked position) this movement is limited by a bolt carrier (not shown), as further explained in the descriptions below (<FIG>).

As also shown in <FIG>, the trigger lever <NUM> can have at least one spur <NUM> which protrudes forward in the area of the trigger axis <NUM> and is oriented substantially parallel to the barrel direction <NUM> and which acts as a drop guard in cooperation with the hammer <NUM>. Two spurs <NUM> are preferably designed, one on each of the two sides of the trigger lever <NUM>, symmetrical to the weapon's center plane. More detailed explanations are described below (see, e.g., details X in <FIG>, <FIG>).

The trigger according to the invention can be designed as a two-stage trigger, or as a three-stage trigger (hereinafter also referred to as a "pull-through trigger"). In the two-stage version, the trigger can assume a rest position <NUM> (<FIG>) (not actuated), a first trigger stage position <NUM> (<FIG>) after overcoming the idle tension and a second trigger stage position <NUM> (<FIG>) after increasing the force on the trigger bar <NUM>. In the second trigger stage position <NUM> (for example depending on the position of the fire-control/safety selector <NUM>), individual shots (single fire) and/or multiple automatic shots (continuous fire) can be released.

Analogous to the two-stage design, the three-stage "pull-through trigger" can also assume a rest position <NUM>, a first trigger stage position <NUM> and a second trigger stage position <NUM>. In addition, the trigger can take a further, third trigger stage position <NUM>. The second trigger stage position <NUM> allows the firing of individual shots (single fire), the third trigger stage position <NUM> is reached after increasing the force on the trigger bar <NUM> and allows the automatic firing of multiple shots (continuous fire).

The trigger according to the invention can, as shown, be designed with a fire-control/safety selector <NUM> which, in a special embodiment, is arranged normal to the weapon's center plane when in the installed condition. The fire-control/safety selector <NUM> allows a desired fire selection position to be selected, with at least two positions - "safe" and "fire" - being possible. Depending on the embodiment of the trigger and the fire-control/safety selector <NUM>, the "fire" position can allow, for example, a single shot ("single fire" position) and/or automatic firing of multiple shots ("continuous fire" position).

In special embodiments, at least one further firing position of the fire-control/safety selector <NUM>, for example "continuous fire," is also possible. In the case of military variants in particular, in addition to the "continuous fire" position, a "burst" fire position may also used, whereby the automatic firing of shots is stopped after, for example, three shots. These additional firing positions are usually known to the person skilled in the art and do not require any further explanation here.

In the "safe" position, the fire-control/safety selector <NUM> blocks the movement of the trigger lever <NUM> and the reaching of the second trigger stage position <NUM>. In the position "fire" (which can be a "single fire" position and/or a "continuous fire" position) the fire-control/safety selector <NUM> releases the movement of the trigger lever <NUM> to reach the second trigger stage position <NUM> and - if available - the third trigger stage position <NUM>.

The fire-control/safety selector <NUM> can be designed as a rotary selector <NUM> (<FIG>) or as a sliding selector <NUM> (<FIG>) with an analogous function. Details of a preferred embodiment of a rotary selector <NUM> with rotary levers (<NUM>, <NUM>) and locking lever <NUM> are shown in <FIG>. A special embodiment of a sliding selector <NUM> is shown in <FIG>.

At this point it should be pointed out that, within the scope of the present invention, different and even arbitrary combinations of the described two- or three-stage trigger with a rotary selector (<NUM>) or sliding selector (<NUM>) device with two or three firing positions can be implemented.

To the person skilled in the art it will be clear from the following description and analysis of <FIG> that further objects according to the invention are achieved with the aid of the one-piece components shown as examples, in particular the trigger lever <NUM>, the sear <NUM>, the disconnector <NUM> and the hammer <NUM>. It should already be noted here that multi-part sears <NUM> and/or disconnectors <NUM> that interact in an analogous manner are also conceivable.

In <FIG>, the sear <NUM> and the disconnector <NUM> are shown in a first embodiment on an enlarged scale. The disconnector <NUM> has a disconnector hook <NUM> on the upper side, which cooperates with the hammer hook <NUM> (<FIG>). At its rear end, the disconnector <NUM> can have an optional back end <NUM> which, in the embodiment shown, has a smaller extension in the transverse direction <NUM> than the central or front section. This enables easier reception/introduction in and/or into the trigger rear <NUM>. As shown, the disconnector <NUM> can have a type of finger <NUM> (<FIG>) in the front section for guiding along the top of the sear <NUM>. The guidance and/or also the support on the upper side of the sear <NUM> can, however, also take place through an alternative and functionally identical design of the pairing of the bearing <NUM> and the disconnector joint <NUM>.

The disconnector <NUM> has a disconnector joint <NUM> on its underside, which has a circular cylindrical section with an axis that runs in the transverse direction <NUM>. This serves for the receiving and rotatable mounting on the upper side of the sear <NUM>, on which a circular cylindrical recess is formed in a complementary shape, whereby a disconnector axis <NUM> is defined in the transverse direction <NUM>. Furthermore, a spring recess <NUM> for a disconnector spring <NUM> is formed on the underside of the disconnector <NUM>. This receptacle, which can be better seen in cross section views, for example in <FIG>, is adapted in diameter and depth to the disconnector spring <NUM> in such a way that it is secured to prevent it from slipping out laterally.

In a preferred embodiment, the sear <NUM>, as shown enlarged in detail C in <FIG>, also has a spring recess <NUM> which is designed as a depression in the direction of the axis of the disconnector spring <NUM>. This spring recess <NUM> is formed on the upper side of the rear of the sear <NUM>, that is to say facing the disconnector <NUM>, and, like the receptacle in the disconnector <NUM>, serves to at least partially receive and prevent the loss of the disconnector spring <NUM>. In the advantageous development shown, the spring recess <NUM> is partially open in at least one transverse direction <NUM>, which facilitates assembly, since the disconnector spring <NUM> does not have to be compressed to the extent that it can be inserted into the recess or receptacle. A ramp <NUM> provided laterally in the area of the opening to the spring recess <NUM> provides further assistance during assembly. Due to the rise of the ramp <NUM> in the direction of the spring recess <NUM>, the disconnector spring <NUM> can be inserted more easily from the side (i.e. moved over it).

In all the embodiments described, however, the function of the disconnector spring <NUM> is the same in that it biases the disconnector <NUM> about the disconnector axis <NUM>, i.e. substantially upward in the direction of hammer hook <NUM> (<FIG>) (counterclockwise in the illustration of <FIG>). The bearing <NUM> is designed to be substantially complementary in shape and function to the disconnector joint <NUM>, as a result of which, in addition to the receptacle, a partial rotation of the disconnector <NUM> within defined rotational limits is made possible. The assembly of the sear <NUM> and the disconnector <NUM> takes place, because of the contact area exceeding <NUM>° and the connection achieved in this way, by shifting from one side in the transverse direction <NUM>, whereby an undesired, independent dismantling or falling apart during operation due to the lateral limitation within the trigger lever <NUM> (<FIG>) is avoided.

Looking together at <FIG> and <FIG>, the function and the sequence of movements of the trigger according to the invention, shown in a special embodiment as a modular trigger unit <NUM> (<FIG>), are clear to those skilled in the art. As already described above, the different positions of the trigger bar <NUM> are referred to as the rest position <NUM>, the first trigger stage position <NUM>, the second trigger stage position <NUM> and, in the case of a pull-through trigger, the third trigger stage position <NUM>.

<FIG> shows an embodiment of the modular trigger unit <NUM> (<FIG>) according to the invention as a plan view from above. The section line A-A shows the section plane for the sections shown in <FIG>. <FIG> shows a partially cut-out side view of an embodiment of the modular trigger unit <NUM> from the right in the area of the hammer <NUM> and auto sear <NUM> and can be read in conjunction with <FIG> (side view from the left). The second arm <NUM> of the hammer spring <NUM>, which is supported in the spring seat <NUM> of the auto sear <NUM>, can be seen very clearly in <FIG>. In the illustration shown, the hammer <NUM> is depicted in the fully upward state, i.e. the hammer <NUM> is in its most possible front position. This position is only reached if there is no firing pin present to block the forward movement of the hammer <NUM> and stop it prematurely, i.e. usually when the hammer <NUM> is removed or if the firing pin is broken, etc..

As shown, a hammer recess <NUM> can be formed on the hammer <NUM> in a special embodiment, which strikes a hammer stop <NUM> of the auto sear <NUM> in such a way that the auto sear edge <NUM> (<FIG> and <FIG>) adjacent to the hammer stop <NUM> remains untouched and protected. Such a design and the protection of the auto sear edge <NUM> in the behind state is advantageous, since mechanical blows of the hammer <NUM> on the auto sear edge <NUM> would cause the hammer <NUM> and/or the auto sear edge <NUM> to wear unnecessarily and prematurely. The service life of the auto sear lever <NUM> assembly and the hammer <NUM> are thus extended by this measure.

In <FIG> an embodiment of the trigger is shown in side view (from the left) in the rest position <NUM>. In the rest position <NUM>, the trigger is not actuated, so the trigger bar <NUM> is spring-biased without any external force.

<FIG> shows the rest position <NUM> in a section along the sectional plane A-A of <FIG>. The hammer <NUM> is under tension, that is, the hammer spring <NUM> (<FIG>) tries to rotate the hammer <NUM> counterclockwise around the hammer axis <NUM> (<FIG>), while its first arm <NUM> rests on the hammer spring support <NUM> (<FIG> and <FIG>). In the area of the hammer axis <NUM>, the hammer <NUM> has at least one hammer cam <NUM> on its outer surface, which is held in the rest position by a sear edge <NUM> of the sear <NUM> (for detailed views of this see <FIG>, in connection with the further trigger movement see also <FIG> and c). The sear edge <NUM> of the disconnector <NUM> is biased by the sear spring <NUM> (<FIG> and <FIG>) against the hammer <NUM> by engaging the sear spring supports <NUM> (<FIG>). As shown, the trigger lever <NUM> is preferably formed integrally, that is to say in one piece, and has a trigger bar <NUM> that protrudes substantially downward in the normal direction <NUM>. In addition, in a special embodiment, as shown, the trigger lever <NUM> can have in its middle section and in the rearward direction (toward <NUM>) in the trigger rear <NUM> a central receiving opening, continuous in direction <NUM>, for receiving the sear <NUM> and the disconnector <NUM>. As can be seen from <FIG>, this can be created by the U-shaped design of the trigger lever <NUM> in this region.

The spring force of the hammer spring <NUM> or its first arm <NUM> (<FIG> and <FIG>) acts on the hammer spring support <NUM> and thereby the trigger rear <NUM> is biased downward. The downward movement of the trigger rear <NUM> is limited by the lower side of the trigger housing <NUM> or, if the lower side of the trigger housing is open, by the lower receiver <NUM> (<FIG>).

In order to discharge a shot, the trigger lever <NUM> actually has to be moved beyond the first trigger stage position <NUM> into the second trigger stage position <NUM>. Otherwise a movement of the hammer <NUM> is blocked by the sear edge <NUM> (in cooperation with the hammer cam <NUM>).

In a particular embodiment, at least one spur <NUM> (in cooperation with the safety cam <NUM>) (<FIG> and <FIG>) can block the hammer <NUM>, as explained below.

As already described with reference to <FIG>, the trigger lever <NUM> can have at least one spur <NUM> that protrudes forward in the area of the trigger axis <NUM> and is oriented substantially parallel to the barrel direction <NUM>. Two spurs <NUM>, which are each formed on each of the two sides of the trigger lever <NUM>, are preferably provided. A step-shaped safety cam <NUM> is formed on the hammer <NUM> in the area of the hammer axis <NUM> and is used to lock the spur <NUM> into place.

The spur <NUM> of the trigger lever <NUM> is, since it lies in front of the trigger axis <NUM> in the barrel direction <NUM>, biased upward and in the rest position <NUM> protrudes into the movement path of the safety cam <NUM> of the hammer <NUM>. In the rest position <NUM>, the spur <NUM> does not yet touch the safety catch <NUM> and a small gap <NUM> (<FIG>) remains between them (detail X of <FIG>, shown enlarged in <FIG>). In the event that the firearm is dropped or it experiences some other unforeseen jolt, impact or blow that causes the sear <NUM> or its trigger edge <NUM> to inadvertently separate from the hammer cam <NUM>, the spur <NUM> can interact with the safety cam <NUM> and help prevent an unintentional upward/forward movement of the hammer <NUM>. The corresponding detailed view X is shown enlarged in <FIG> show the same section, labeled Y and Z, from <FIG> and <FIG>, correspondingly in the first and second trigger stage positions <NUM> and <NUM>, respectively.

In this particular embodiment, the intended shot is fired analogously to the sequence described above by overcoming the first or second trigger stage positions <NUM>, <NUM>, whereby when the first trigger stage position <NUM> is reached, the spur <NUM> lies outside the path of the safety cam <NUM> and the movement of the hammer <NUM> is thus released in the upward/forward direction.

The auto sear <NUM> is biased by the second arm <NUM> of the hammer spring <NUM>, which acts on the spring seat <NUM>, that is, the hammer spring <NUM> tries (in the illustration of <FIG>) to turn the auto sear <NUM> clockwise about the sear axis <NUM> (in the illustration of <FIG>, but in a differently oriented representation counterclockwise). However, the top <NUM> of the auto sear <NUM> is held in position by the bolt carrier (not shown) directly above it against the spring bias toward the front (and down) so that the edge <NUM> of the auto sear <NUM> does not protrude into the path of movement of the hammer <NUM> or the auto sear hook <NUM>. The function of the auto sear <NUM> can be clearly seen in conjunction with <FIG> and is described further below.

The fire-control/safety selector <NUM> is held in a selectable position by a locking lever <NUM> which is biased by the locking lever spring <NUM> acting on the locking lever body <NUM> (<FIG>), wherein the locking lever spring <NUM> is supported on the trigger housing <NUM> (see also <FIG> and <FIG>). In other words: the locking lever <NUM> serves, among other things, for temporarily fixing the fire-control/safety selector <NUM> in a predefined position. The fire-control/safety selector <NUM>, depicted as a rotary selector <NUM> in the example shown, is in the "safe" position and allows little or no deflection of the trigger lever <NUM>.

<FIG> and b show the trigger unit in the safe state and in the first trigger stage position <NUM> in a side view and a section along the sectional plane A-A from <FIG>. The rear part <NUM> of the trigger lever <NUM> is moved slightly upward about the trigger axis <NUM> by only slight pressure on the trigger bar <NUM>, and the spurs <NUM> are accordingly moved downward (see above functional description). In the particular embodiment explained above, the movement path of the safety cam <NUM> can already be released in the first trigger stage position <NUM> in order to be able to tension the hammer <NUM> in the first trigger stage position <NUM> if necessary. The sear edge <NUM> of the sear <NUM> does not yet release the movement path of the hammer cam <NUM> (<FIG>) of the hammer <NUM> in this position (see <FIG>).

The corresponding detailed views M and L of <FIG> and <FIG> are shown in <FIG>, where it can be seen that in the rest position <NUM>, the contact surface <NUM> of the trigger lever <NUM> (on the trigger rear <NUM>) is at a small distance from the sear bottom <NUM>, in other words, the contact surface <NUM> does not touch the sear bottom <NUM>. Only by overcoming the idle tension and reaching the first trigger stage position <NUM> (<FIG>) does the contact surface <NUM> and the sear bottom <NUM> come into contact. Only with further pressure on the trigger lever <NUM> beyond the first trigger stage position <NUM> does the trigger lever <NUM> and the sear <NUM> execute a simultaneous, common rotary movement about the common axis <NUM>, <NUM> (<FIG> and <FIG>). In other words, the sear <NUM> remains immobile from the rest position <NUM> until the first trigger stage position <NUM> is reached and the sear <NUM> does not join in the rotary movement of the trigger lever <NUM> until the first trigger stage position <NUM> is reached/exceeded.

As shown in <FIG>, the sear <NUM> lies in the path of movement of the hammer <NUM> until the first trigger stage position <NUM> is reached; the sear edge <NUM> blocks the hammer cam <NUM>. Only with further pressure on the trigger lever <NUM> beyond the first trigger stage position <NUM> into the second trigger stage position <NUM> does the sear <NUM> with the sear edge <NUM> release the movement of the hammer <NUM> with the hammer cam <NUM> (see in comparison <FIG>). In the safe position shown in <FIG>, however, the fire-control/safety selector <NUM>, shown in the variant as a rotary selector <NUM>, prevents further movement of the trigger lever <NUM> beyond the first trigger stage position <NUM>, since the trigger rear <NUM> strikes the rotary selector <NUM>.

In <FIG>, the trigger unit <NUM> (<FIG>) is shown with fire-control/safety selector <NUM> (variant as a rotary selector <NUM>) in the single fire position in the second trigger stage position <NUM>. The rotary selector <NUM> is in the single fire position and allows the trigger lever <NUM> to be deflected into the second trigger stage position <NUM>. The sear edge <NUM> of the sear <NUM> releases the path of movement of the hammer <NUM> including its hammer cam <NUM> (see in comparison <FIG>), it thus performs a rotary movement of the hammer <NUM> in the hammer upward/forward rotating direction <NUM>, indicated by a dashed arrow, under the action of the hammer spring <NUM>, and hits, when installed in the weapon, on the firing pin (not shown).

<FIG> shows the situation after the shot has been fired, analogous to <FIG>: After the shot has been fired, the bolt carrier (not shown) moves backward and tensions the hammer <NUM> in the process. As is common in the prior art, a disconnector hook <NUM> of the disconnector <NUM> is designed in such a way that the hammer hook <NUM> presses the disconnector hook <NUM> with the disconnector <NUM> to the rear during tensioning, wherein the disconnector <NUM> is rotated slightly about the disconnector axis <NUM> (<FIG>). The disconnector spring <NUM> (<FIG> and <FIG>) is (further) compressed and brings the disconnector <NUM> back into its original position as soon as the hammer hook <NUM> has passed the disconnector hook <NUM>. The disconnector <NUM> with the disconnector hook <NUM> now catches the hammer <NUM>, which is biased by the hammer spring <NUM> and pushes forward again, on the hammer hook <NUM> and prevents further movement of the hammer <NUM>.

A detailed view of the area Z of <FIG> is shown in <FIG>, wherein it also is clearly visible that the safety pin <NUM> in the second trigger stage position <NUM> releases the movement path of the safety cam <NUM> (as already described above).

<FIG> shows a particular embodiment of the trigger unit <NUM> (<FIG>) in the continuous fire position in the second trigger stage position <NUM>. The rotary selector <NUM> is set in such a way that the stud <NUM> presses the back end <NUM> (<FIG>) of the disconnector <NUM> downward so that it lies at least partially within the correspondingly shaped trigger rear <NUM>. As a result, the disconnector <NUM> is rotated about the disconnector axis <NUM>, as a result of which the disconnector hook <NUM> is no longer in the path of movement of the hammer <NUM>, in particular, of the hammer hook <NUM>.

<FIG> shows the trigger unit <NUM> (<FIG>) in the continuous fire position in the second trigger stage position <NUM>, wherein the movement of the hammer <NUM> is blocked by the auto sear <NUM> until a bolt carrier (not shown) presses the auto sear <NUM> at the top <NUM> downward when it advances into the locked state. As soon as the shot breaks and the slide is moved backward for automatic reloading, a special shape of the slide, for example in the form of a corresponding notch on the underside of the slide, allows the auto sear <NUM>, which is spring-loaded by the second arm <NUM> of the hammer spring <NUM>, performs a limited rotational movement about the auto sear axis <NUM> (<FIG>). As a result, the auto sear edge <NUM> comes back into the path of movement of the hammer <NUM>, because its auto sear hook <NUM> strikes the auto sear edge <NUM>. As a result, the hammer <NUM> is prevented from further movement in the hammer upward/forward rotating direction <NUM>. The bolt carrier pushes the top <NUM> downward again after the reloading process has ended and the breech is already in the locked state. This sequence ensures that, in the case of multiple automatic firing of shots (in continuous fire), the hammer <NUM> can only discharge the next shot after the breech has been completely locked.

This aspect of the invention can therefore substantially be summarized as follows:
The invention relates to a trigger unit (<NUM>) for a firearm, comprising:.

It is characterized in that the trigger lever (<NUM>) has a recess and the sear (<NUM>) is at least partially arranged within the recess,.

In one embodiment it is provided that a limiter (<NUM>) is arranged in the trigger unit (<NUM>) and is rotatable mounted about a locking lever axis (<NUM>) parallel to the transverse direction (<NUM>) and is biased by a locking lever spring (<NUM>).

In a further embodiment with a rest position (<NUM>) and three trigger stage positions (<NUM>, <NUM>, <NUM>) for the trigger lever (<NUM>), it is provided that in the trigger unit (<NUM>) a rocker lever (<NUM>) is arranged around a rocker axis (<NUM>), when viewed in the barrel direction (<NUM>), in front of the trigger axis (<NUM>), that the rocker lever (<NUM>) has a first end (<NUM>) and a second end (<NUM>) that in the third trigger stage position (<NUM>) the first end (<NUM>) of the rocker lever (<NUM>) is pressed downward by the sear (<NUM>), when viewed in the normal direction (<NUM>), and the rocker lever (<NUM>) is rotated about the rocker axis (<NUM>), and that the second end (<NUM>) of the rocker lever (<NUM>) protrudes upward in the third trigger stage position (<NUM>) and moves the disconnector (<NUM>) upward on a finger (<NUM>), when viewed in the normal direction (<NUM>), and rotates it around the disconnector axis (<NUM>).

In a further development, it is provided that the sear (<NUM>) has a sear opening (<NUM>) arranged in front of the disconnector axis (<NUM>) for the second end (<NUM>) of the rocker lever (<NUM>) to reach through, when viewed in the barrel direction (<NUM>).

Another development provides that in the trigger unit (<NUM>) an auto sear (<NUM>), biased by the hammer spring (<NUM>) and rotatable mounted about an auto sear axis (<NUM>), when viewed in the barrel direction (<NUM>), is arranged in front of the hammer axis (<NUM>).

In yet another further development, a spring seat (<NUM>) for supporting the second arm (<NUM>) of the hammer spring (<NUM>) is formed on the auto sear (<NUM>), when viewed in the normal direction (<NUM>), below the auto sear axis (<NUM>).

In an advantageous further development it is provided that the first arm (<NUM>) of the hammer spring (<NUM>) is supported on the hammer spring support (<NUM>) of the trigger lever (<NUM>), and the second arm (<NUM>) of the hammer spring (<NUM>) supported on the spring seat (<NUM>) of the auto sear (<NUM>).

In yet another further development, it is provided that a hammer spring support (<NUM>) for supporting the hammer spring (<NUM>) is formed on the trigger lever (<NUM>) in the transverse direction (<NUM>).

In an advantageous embodiment it is provided that the disconnector (<NUM>), when viewed in the normal direction (<NUM>), has a spring recess (<NUM>) on its underside for at least partial accommodation of a disconnector spring (<NUM>).

In a further development it is provided that the spring recess (<NUM>) is at least partially open when viewed laterally in at least one transverse direction (<NUM>).

In a further development of this embodiment it is provided that the spring recess (<NUM>) has an outwardly sloping ramp (<NUM>) when viewed in the transverse direction (<NUM>).

Another further development of the basic idea provides that at least one spur (<NUM>) extending from the trigger axis (<NUM>) in the barrel direction (<NUM>) is formed on the trigger lever (<NUM>) and a spur (<NUM>) is formed on the hammer (<NUM>) in the area of the hammer axis (<NUM>), and that the spur (<NUM>) protrudes in the rest position (<NUM>) and when in the first trigger stage position (<NUM>), into a movement path of the safety cam (<NUM>) of the hammer (<NUM>).

Another development provides that a back end (<NUM>) is formed on the disconnector (<NUM>) and in the second trigger stage position (<NUM>) a stud (<NUM>) of a rotary selector (<NUM>) presses down against the force of a disconnector spring (<NUM>).

In one embodiment it is provided that the trigger unit (<NUM>) is accommodated in a trigger housing (<NUM>) which is preferably designed as a modular drop-in unit.

Finally, the invention comprises a firearm which has a trigger unit (<NUM>) with the features defined above.

As previously described above, the trigger according to the invention can also be designed in three stages as a pull-through trigger. As already explained, with a pull-through trigger, continuous fire can be achieved by pulling the trigger bar <NUM> all the way through the second trigger stage position <NUM> into a third trigger stage position <NUM>, possibly without changing the position of the fire-control/safety selector <NUM>. In <FIG>, similar to <FIG>, such a pull-through trigger is shown in a preferred embodiment as a trigger unit <NUM> with a trigger housing <NUM> as an exploded view.

The pull-through variant comprises, like the two-stage trigger described above with reference to <FIG>, a hammer <NUM>, a trigger lever <NUM>, a sear <NUM>, a disconnector <NUM>, an auto sear <NUM>, a fire-control/safety selector <NUM> and a locking lever <NUM>, which are designed analogously in form and function as described above. The pull-through trigger can also be arranged as a trigger unit <NUM> in a trigger housing <NUM> analogously to the two-stage embodiment already described.

In a modification of the two-stage trigger described above, the illustrated embodiment of a pull-through trigger includes an additional limiter <NUM>, which is mounted between the locking lever <NUM> and the locking lever spring <NUM> so as to be rotatable about the locking lever axis <NUM>. Furthermore, the pull-through trigger has a rocker lever <NUM> which, in the embodiment shown, is rotatable supported by a dowel pin <NUM> about a rocker axis <NUM>. The rocker axis <NUM> is arranged in front of the trigger axis <NUM> when viewed in the barrel direction <NUM>. The sear <NUM> has a sear opening <NUM> through which the rocker lever <NUM> partially protrudes and, when viewed in the barrel direction <NUM>, in front of it a front end <NUM> with an underside formed on the sear <NUM>. No back end (compare with <NUM> in <FIG>) is provided on the disconnector <NUM> in this embodiment as shown in <FIG>.

The embodiment as a pull-through trigger can be designed with a fire-control/safety selector <NUM>, wherein the fire-control/safety selector <NUM> can be designed as a rotary selector <NUM> or a sliding selector <NUM>. The fire-control/safety selector <NUM> can preferably have at least two positions ("safe" and "fire"), i.e. with the fire-control/safety selector <NUM> in the "fire" position the user of the firearm can fire individual shots ("single fire") by pulling the trigger bar <NUM> to the first trigger stage position <NUM>, or fire multiple shots ("continuous fire") by pulling the trigger bar <NUM> through to the third trigger stage position <NUM>.

However, a fire-control/safety selector <NUM> with, for example, three or more positions is also conceivable ("safe," "single fire" and "continuous fire," or also "burst fire"). By selecting the "single fire" position of the fire-control/safety selector <NUM>, the trigger bar <NUM> cannot be pulled through into the third trigger stage position <NUM> and only individual shots can be fired ("single fire"). With the fire-control/safety selector <NUM> in the "continuous fire" position, the trigger bar <NUM> can be moved to the third trigger stage position <NUM> and multiple shots can be automatically fired.

The variant of the pull-through trigger shown has a fire-control/safety selector <NUM> that is a sliding selector <NUM> with two positions, wherein a rotary selector <NUM> can also be used, as described in the following and is shown in <FIG>. The pull-through trigger can also be used on its own. Likewise, a sliding selector <NUM> or a rotary selector <NUM> can be implemented independently with the trigger variant described above.

On the locking lever <NUM> for the sliding selector <NUM>, no spike <NUM> is required on the locking lever arm <NUM>; instead, the locking lever <NUM> preferably comprises, as shown, a spring-loaded plunger <NUM>, which is arranged laterally in the locking lever <NUM> and normal to the barrel axis (in the transverse direction <NUM>) and is connected to the locking lever <NUM> (for example screwed in, glued, etc.). The spring-loaded plunger <NUM> engages in a detent in the trigger housing <NUM> or in the receiver <NUM> of the firearm and thus holds the locking lever <NUM> in position.

In <FIG> an embodiment of a pull-through variant of the trigger unit <NUM> according to the invention is shown in section views along the sectional plane A-A (as in <FIG>) in different trigger stage positions <NUM>, <NUM>, <NUM>, <NUM>; and the details of the sliding selector <NUM> are shown in <FIG>. The function of the individual parts can be seen by looking at them together.

<FIG> shows the pull-through trigger with the trigger bar <NUM> in the rest position <NUM> with the sliding selector <NUM> in the "safe" position with the hammer <NUM> under tension from the hammer spring <NUM>, and <FIG> shows the trigger bar <NUM> moving towards the first trigger stage position <NUM> (cf. The trigger lever <NUM> cannot be moved any further with the sliding selector <NUM> in the "safe" position, since the rear part <NUM> of the trigger strikes the sliding selector <NUM>. The rocker lever <NUM> rotatable mounted around the dowel pin <NUM> has a first, front end <NUM>, and a second, rear end <NUM>, and is substantially V-shaped in this section with an extended central angle, although other variants with the same function, such as U-shaped, or others, are also possible. The second end <NUM> of the dowel pin <NUM> protrudes obliquely upward into the sear opening <NUM> of the sear <NUM> and can touch the disconnector <NUM> on the finger <NUM>.

The limiter <NUM>, which is rotatable mounted about the locking lever axis <NUM>, is biased by the locking lever spring <NUM> supported on the trigger housing <NUM> and is pressed counterclockwise against the locking lever <NUM>, as shown in the illustration, and is limited thereby in its rotational movement.

In the "fire" position, <FIG>, a corresponding recess <NUM> (cf. <FIG>) in the fire-control/safety selector <NUM>, with a sliding selector <NUM> shown in the illustration, allows a further movement of the trigger lever <NUM> into the second trigger stage position <NUM>. The movement of the trigger lever <NUM> is now limited by the contact surface <NUM> of the trigger rear <NUM> contacting the counter surface <NUM> of the projection <NUM> formed on the limiter <NUM>. As already described above, in the second trigger stage position <NUM> the sear <NUM> releases the movement of the hammer <NUM>, which rotates accordingly in the hammer rotating direction <NUM> (see <FIG>) about the hammer axis <NUM>. Also already described in detail above (see <FIG>), the disconnector <NUM> catches the hammer <NUM> in its backward movement after a shot has been fired.

If the trigger bar <NUM> is now "fully pulled through" beyond the second trigger stage position <NUM>, as shown in <FIG>, the third trigger stage position <NUM> is reached. In order to reach the third trigger stage position <NUM>, additional force has to act on the trigger bar <NUM>, since the projection <NUM> of the limiter <NUM> has to be moved upward from the trigger rear <NUM>. This results in additional trigger resistance, since the limiter <NUM> can only be rotated against the spring preload from the locking lever spring <NUM> (clockwise in the illustration shown) about the locking lever axis <NUM> of the locking lever pin <NUM>. The shooter will be able to clearly perceive and easily recognize a difference between single fire and continuous fire (fully drawn) while pulling the trigger bar <NUM> to the rearward position. Further movement of the trigger lever <NUM> can be limited by abutting the trigger rear <NUM>, for example on the fire-control/safety selector <NUM> or on the trigger housing <NUM>. However, it is also possible to limit the further movement of the trigger lever <NUM> in another way, for example by abutting the limiter <NUM> on the trigger housing <NUM>.

The function of the rocker lever <NUM> can also be clearly seen in <FIG>. In the third trigger stage position <NUM>, the first, front end <NUM> of the rocker lever <NUM> is pressed down from the underside of the front end <NUM> of the sear <NUM>, which is arranged in front of the sear axis <NUM>, and the rocker lever <NUM> is rotated about the rocker axis <NUM> and the dowel pin <NUM>. Correspondingly, the second, rear end <NUM> of the rocker lever <NUM> moves out of the sear opening <NUM> and upward beyond the sear <NUM> and, during this movement, entrains the finger <NUM> of the disconnector <NUM> resting on the sear <NUM>. This movement causes the disconnector <NUM> to rotate about the disconnector axis <NUM> so that the disconnector hook <NUM> no longer protrudes into the path of movement of the hammer <NUM>, whereby continuous fire is possible.

It should be pointed out at this point that in addition to the illustrated embodiment of the rocker lever <NUM> and the sear <NUM> with opening <NUM> for the passage of the second, rear end <NUM> of the rocker lever <NUM>, other functionally identical shapes can also be used and, for example, the rocker lever and the sear can be side by side, however it is essential that the second, rear end <NUM> presses the disconnector <NUM> on its finger <NUM> upward and away from the sear <NUM> when the trigger bar <NUM> is pulled through to the rear. Designs are also conceivable in which the sear <NUM> is formed integrally with the trigger lever <NUM>.

The pull-through trigger according to the invention can, as shown, comprise a fire-control/safety selector <NUM> that is designed, for example as a rotary selector <NUM> or sliding selector <NUM>, as well as an auto sear <NUM> which functions as has already been described above (see <FIG>). However, the invention is not limited to these embodiments and , for example, an auto sear arranged behind the trigger axis (such as known from firearms derived from the traditional AR-<NUM> platform), or other embodiments can easily be designed by those skilled in the art with knowledge of the invention and the envisioned field of application.

As already described above, the fire-control/safety selector <NUM> can be designed as a rotary selector <NUM>. <FIG> and b show a preferred embodiment of a rotary selector <NUM> having a first rotary lever <NUM> and a second rotary lever <NUM> in a perspective view from two angles. To actuate the rotary selector <NUM>, one or more actuators <NUM> can be formed on one or both of the rotary levers <NUM>, <NUM>, which in the installed condition are arranged outside of the trigger housing. For ease of operation, these actuators <NUM> can have, or form haptically optimized (fluted, roughened, etc.), gripping surfaces. Adjacent to the actuators <NUM>, as shown, sealing plates <NUM> can be arranged, which seal the rotary selector <NUM> to the outside of the trigger housing <NUM> in the installed condition. As shown, a stop nipple <NUM> and/or an indicator window <NUM> (<FIG>) for displaying the firing position can be formed on the sealing plate <NUM>.

As is customary in the prior art, the rotary selector <NUM> comprises a cam surface <NUM>, which preferably has a stud <NUM>. The first rotary lever <NUM> comprises a cylinder <NUM> with a substantially cylindrical end section <NUM> adjoining it, wherein the end section <NUM> has a smaller outer diameter than the cylinder <NUM>. At least one detent <NUM> is formed on the end section <NUM>. Two detents or several detents <NUM> (see <FIG> in conjunction with <FIG>) are preferably arranged on a line in the circumferential direction of the cylinder <NUM> and at least one rib <NUM> that is oriented parallel to the cylinder axis. In addition, one or more detents <NUM> can be arranged on a connecting piece between the sealing plate <NUM> and the cylinder <NUM>.

In a preferred embodiment, the first rotary lever <NUM> can also have further detents <NUM> on the cylinder <NUM> adjacent to the cam surface <NUM>, which are arranged on a line in the circumferential direction. These further detents <NUM> can be arranged, for example, between the cam surface <NUM> and the actuator <NUM>. Each of the detents <NUM> formed on a line lying in the circumferential direction corresponds to a corresponding fire selection position (with two notches for "safe" and "fire," or with three notches for "safe," "fire" and "continuous fire"). These characteristics apply mutatis mutandis to the eventual formation of a "burst fire" position.

The second rotary lever <NUM> comprises a hollow cylinder <NUM> with a hollow cylinder axis <NUM> which has at least one selector slot <NUM> running in the circumferential direction and a continuous notch <NUM> running parallel to the cylinder axis <NUM>. The inside diameter of the hollow cylinder <NUM> corresponds to the outside diameter of the end section <NUM>, and the outside diameter of the hollow cylinder <NUM> corresponds to the outside diameter of the middle section of the cylinder <NUM>. The end section <NUM> with the rib <NUM> is designed to complement the shape of the hollow cylinder <NUM> with the continuous notch <NUM> and allows the end section <NUM> to be pushed into the hollow cylinder <NUM>. The continuous notch <NUM> receives the rib <NUM> and the selector slot <NUM> is arranged above the detents <NUM> on the end section <NUM>, whereby the detent <NUM> remains accessible from the outside. The detents <NUM> and the selector slot <NUM> above appear like a notch with detents <NUM> and act accordingly.

In the installed condition, the first and second rotary levers <NUM>, <NUM> are connected to one another in such a way that they are non-rotatable and a common rotation about the cylinder axis <NUM> through one-sided operation is possible. In the installed condition, the rotary selector <NUM> is secured by the engagement of the locking lever <NUM> with the locking lever arm <NUM> and spike <NUM>, whereby the rotary selector <NUM> is protected against being pulled apart or unintentionally falling apart - see also <FIG>.

In <FIG> and b a cross section of an embodiment of a rotary selector <NUM> along the line in the section plane A-A (as in <FIG>) is shown in the viewing direction to the front. <FIG> shows a rotary selector <NUM> with three positions (three-part cam surface <NUM> with stud <NUM> for "safe," "fire" and "continuous fire"). <FIG> shows a rotary selector <NUM> with two positions (two-part cam surface <NUM> for "safe" and "fire"), as it can be implemented, for example, in the pull-through trigger variant described below or for variants that do not allow continuous fire.

<FIG> shows a trigger housing <NUM> in a side plan view. <FIG> shows the trigger housing <NUM> in a perspective view. The selector hole <NUM> accommodates the fire-control/safety selector <NUM> or, in the embodiment shown, the cylinder <NUM> and the hollow cylinder <NUM> of a rotary selector <NUM>. In the illustration shown, a selector cam <NUM> and an indicator <NUM> are also provided. The locking lever recess <NUM> serves to receive the locking lever <NUM> and the locking lever spring <NUM>, which is supported on the trigger housing <NUM>, and, in the pull-through trigger described above, to also accommodate a limiter <NUM> (<FIG>). In the installed condition, the indicator <NUM> is largely covered by the sealing plate <NUM> of the rotary selector <NUM>, but the respectively selected firing position of the indicator <NUM> remains visible to the user through the indicator window <NUM> (<FIG>). In the installed condition, a stop nipple <NUM> (<FIG>) of the rotary selector <NUM> lies in the selector cam <NUM> and limits the possible rotational movement of the rotary selector <NUM> in the circumferential direction.

<FIG> shows a preferred embodiment of the rotary selector <NUM> in the installed condition with the locking lever <NUM>, wherein the trigger housing <NUM> is not shown for better visibility. The locking lever <NUM> is mounted rotatable about a locking lever axis <NUM> of the locking lever pin <NUM> and is biased by the locking lever spring <NUM>, wherein the locking lever spring <NUM> is supported in the trigger housing <NUM> and on the locking lever body <NUM>. The locking lever <NUM> is thus biased counterclockwise around the locking lever pin <NUM> (within the locking lever axis <NUM>) acting as the axis of rotation in the direction of the movement arrow in <FIG>. At least one spike <NUM> is formed on the locking lever arm <NUM>, which protrudes through the selector slot <NUM> and engages in a detent <NUM> of the end section <NUM>. In this way, the two rotary levers <NUM>, <NUM> can no longer be displaced in the direction of the cylinder axis (not even relative to one another).

In the installed condition, a firing position is selected by turning the rotary selector <NUM>. The locking lever <NUM> is pressed backward against its spring preload, so that the spike <NUM> is pressed out of a detent (recess) <NUM> and, upon further rotation, is pressed into the next detent <NUM> by the spring force of the locking lever spring <NUM>. The spike <NUM> protrudes into selector slot <NUM> at all times during this rotary movement, which prevents the two rotary levers <NUM>, <NUM> from being pulled apart or inadvertently falling apart.

Only by actively pushing the locking lever body <NUM> backward can the locking lever arm <NUM> with the spike <NUM> be turned upward so far that the spike <NUM> no longer protrudes into the selector slot <NUM>, whereby the two rotary levers <NUM>, <NUM> can be pulled apart. This allows the rotary selector <NUM> to be dismantled or replaced without tools. It is also possible to easily swap a rotary selector <NUM> with three positions for a rotary selector <NUM> with two positions (e.g. without the "continuous fire" position). This special version of a rotary selector <NUM> with locking lever <NUM> may represent an invention of its own.

It is also easily feasible for a person skilled in the art, with knowledge of the invention, to use the inventive rotary selector <NUM> (even without connection to the locking lever <NUM>) in a slightly modified embodiment trigger systems other than the systems described herein, such as the triggers utilized in firearms based on the traditional AR-<NUM> platform. The spring-loaded pressure pin that is typically arranged in the grip and lower receiver of firearms based on the traditional AR-<NUM> platform would now engage the rotary selector <NUM> and secure it in place, instead of the spike <NUM> through the selector slot <NUM> in the detent <NUM> as detailed above.

Details of the sliding selector <NUM> proposed in one embodiment of the invention are shown in <FIG> to c, with the directional arrows indicating the orientation of the view in each case. The sliding selector <NUM> has an elongated, approximately cuboid shape with a cross section that is substantially the same over most of the length, and the selector opening <NUM> is also correspondingly complementary in shape. In the example shown, the cross section is rectangular, but round, oval, square and other cross sections are also possible. On the two longitudinal ends, push portions <NUM> for operating the sliding selector <NUM> (displacement in or against the transverse direction <NUM>) are formed. At one end, as shown, a top <NUM> may be formed which has an enlarged cross section. At least one recess <NUM> is formed on the underside of the sliding selector <NUM> facing the trigger lever <NUM> (clearly visible in <FIG> as a view from below), which releases the movement of the trigger lever <NUM> into second trigger stage position <NUM> and/or the third trigger stage position <NUM> with a corresponding position of the sliding selector <NUM>. In a further embodiment, the recess <NUM> can also be designed in two stages or in multiple stages in order to enable a sliding selector <NUM> with three (or more) positions.

At least one pair of parallel and mutually merging grooves <NUM>, which serve as detent positions for the locking lever <NUM>, is formed on the outer contour of the sliding selector <NUM> facing the locking lever <NUM>. In the installed condition, the sliding selector <NUM> is preferably arranged in its longitudinal direction normal to the barrel direction <NUM> in the transverse direction <NUM>, whereby the grooves <NUM> are formed substantially parallel to the barrel direction <NUM> or parallel to the center plane of the weapon. In the installed condition, the sliding selector <NUM> can protrude with both ends over the firearm's receiver <NUM> or - depending on the position - end flush with the receiver <NUM> on one side. In principle, it is also conceivable that one end lies in at least one position within the receiver <NUM>.

<FIG> shows the sliding selector <NUM> in the installed condition with the locking lever <NUM>, locking lever spring <NUM> and limiter <NUM> and without the trigger housing <NUM> for better visibility. In the particular embodiment shown, two pairs of grooves <NUM> merging into one another are formed on the outer contour of the sliding selector <NUM>. In a preferred embodiment, the grooves <NUM> are elongated and V-shaped and merge, for example, in a U-shape (or with a rounding or an inclined transition surface) to thus form a continuous, contoured depression in the surface of the sliding selector <NUM>. The locking lever <NUM> and limiter <NUM> are rotatable mounted around the locking lever pin <NUM>. The locking lever spring <NUM> is supported on the trigger housing <NUM> (not shown) and biases the limiter <NUM>. The limiter <NUM> in turn rests on the locking lever <NUM>, whereby the locking lever <NUM> is also spring-biased. Correspondingly, a locking lever arm <NUM> formed on the locking lever <NUM> (two locking lever arms <NUM> can be seen in the embodiment shown) is pressed into a groove <NUM> and thus holds the sliding selector <NUM> in position.

If the sliding selector <NUM> is now shifted in the transverse direction <NUM> (in the position shown in the direction of the second groove <NUM> of the pair of grooves) by pressing on the push portion <NUM>, the locking lever arm <NUM> is pressed against the spring preload thereby making it possible to shift the sliding selector <NUM> from the first firing position to the second firing position. As a result of the spring preload, the locking lever <NUM> engages in the second groove <NUM> of the pair of grooves after the second firing position has been reached.

Each groove <NUM> of a groove pair has a stop <NUM> on the side facing the other groove <NUM>, so that further displacement of the sliding selector <NUM> is limited by the locking lever arm <NUM> contacting the stop <NUM> (<FIG>). In this way, the sliding selector <NUM> is secured against being pulled apart or inadvertently falling apart.

As shown, a spring-loaded plunger <NUM> can be arranged on one side of the locking lever <NUM> so that it interacts in a locking position on the inside of the trigger housing <NUM> and thus holds the locking lever <NUM> in position. The locking lever <NUM> will be held in position even if, for example, the trigger is pulled through to the trigger stage position <NUM>, because the limiter <NUM> is pressed backward against its spring preload and thus already releases a movement of the locking lever <NUM>. As a variant, it is also possible to arrange a further spring between the limiter <NUM> and the locking lever <NUM>.

In addition to <FIG> shows a cross section of a sliding selector <NUM> analogous to the section plane A-A in <FIG>.

As already described, the fire-control/safety selector <NUM> can be exchanged easily and without tools using the locking lever <NUM> according to the invention. The locking lever <NUM> only has to be pushed back against its spring preload to release the detent <NUM> (in the case of a rotary selector <NUM>), or the groove <NUM> (in the case of a sliding selector <NUM>), and thus the fire-control/safety selector <NUM>. A rotary selector <NUM> with three positions can easily be exchanged for a rotary selector <NUM> with two positions and vice versa. Likewise, a sliding selector <NUM> with two positions can easily be exchanged for one with three positions (and vice versa). If the cross-sectional shapes of the rotary and sliding selectors <NUM>, <NUM> are appropriately selected and the selector opening <NUM> is appropriately shaped, it is also conceivable to exchange a rotary selector <NUM> for a sliding selector <NUM>. For example, the sliding selector <NUM> can be round and have the same diameter as the cylinder <NUM> of the rotary selector <NUM>; the interaction of the locking lever <NUM> with the detent <NUM> prevents a round shaped sliding selector <NUM> from turning.

However, a round shaped sliding selector <NUM> with an external longitudinal rib is also conceivable, which acts as a rotary selector with a corresponding longitudinal groove in the selector opening <NUM>. Other forms of a selector opening <NUM> are also possible, which can accommodate both a rotary selector <NUM> and a sliding selector <NUM> with different cross sections.

The described sliding selector <NUM> according to the invention can also be used with triggers other than those described herein, including those known from the prior art, and it is not limited to the examples shown.

The pull-through trigger shown in <FIG>, is possible as a variant with a rotary selector <NUM> according to the description above, as the two-stage trigger shown in <FIG> can also be executed with a sliding selector <NUM>. The possibilities of combinations of the individual embodiments described are not limited to the variants shown and described.

The trigger described above can be designed in two stages or as a three-stage pull-through trigger. In each case, an embodiment with a fire-control/safety selector <NUM>, which is designed as a rotary selector <NUM> or a sliding selector <NUM>, is possible, wherein the fire-control/safety selector <NUM> can each have two or three fire positions.

According to the above statements, it is easily possible for a person skilled in the art to implement variants of the trigger according to the invention without a continuous fire function, in which, for example, the limiter <NUM> or the stud <NUM> are omitted.

This aspect of the invention can therefore substantially be summarized as follows:
The invention relates to a trigger unit (<NUM>) for a firearm comprising a trigger lever (<NUM>) mounted rotatable about a trigger axis (<NUM>) which, preferably formed integrally with it, has a trigger bar (<NUM>) which, viewed in a normal direction (<NUM>), lies below the trigger axis (<NUM>) and when the trigger unit (<NUM>) is actuated when the trigger bar (<NUM>) is moved against a barrel direction (<NUM>), and a fire-control/safety selector (<NUM>) for selecting at least one "safe" and one "fire" position. It is characterized in that a locking lever (<NUM>) rotatable mounted about a locking lever axis (<NUM>) is arranged in the trigger unit (<NUM>) and is biased in the circumferential direction by a locking lever spring (<NUM>), and that the locking lever axis (<NUM>), considered in the barrel direction (<NUM>), is arranged behind the trigger axis (<NUM>), and the locking lever (<NUM>) is designed for releasably fixing the fire-control/safety selector (<NUM>) in a selectable position.

In a further development it is provided that the fire-control/safety selector (<NUM>) is designed as a rotary selector (<NUM>) which is rotatable mounted about an axis parallel to the normal direction (<NUM>) and comprises a first rotary lever (<NUM>) and a second rotary lever (<NUM>),.

In one embodiment, it is provided that in the installation situation in a firearm having a locking lever (<NUM>), the two rotary levers (<NUM>, <NUM>) of the rotary selector (<NUM>), by engaging a spike (<NUM>) of the locking lever (<NUM>) in the selector slot (<NUM>), are secured against axially moving apart, and that the rotary selector (<NUM>) is secured in this way in the trigger housing (<NUM>).

The basic idea can advantageously be further developed in such a way that the fire-control/safety selector (<NUM>) is designed as a sliding selector (<NUM>) which is mounted displaceably along an axis parallel to the normal direction (<NUM>), and.

This configuration can be further developed by the sliding selector (<NUM>) having an outer contour with which it is displaceably guided in at least one opening of complementary shape in a trigger housing (<NUM>) or in the receiver (<NUM>, <NUM>, <NUM>) of the firearm.

The basic idea can advantageously be further developed so that the locking lever (<NUM>) comprises on one side a push portion (<NUM>) which is oriented in the transverse direction (<NUM>) and which, when installed, engages in a detent in a trigger housing (<NUM>) or in the receiver (<NUM>, <NUM>) of the firearm.

This configuration can be further developed by the trigger housing (<NUM>) having the opening of complementary shape in which the sliding selector (<NUM>) is displaceably guided.

The basic idea can advantageously be further developed so that the trigger unit (<NUM>) is housed in a trigger housing (<NUM>), which is preferably designed as a modular drop-in unit.

The invention also comprises a firearm which has one of the trigger units (<NUM>) defined above.

The trigger according to the invention is shown in <FIG> and <FIG>. As already described, the trigger can preferably be arranged as a trigger unit <NUM> in a trigger housing <NUM>. A configuration of the invention that is designed as a modular drop-in trigger unit <NUM> can be particularly advantageous.

<FIG> shows a section of the lower receiver <NUM> of a firearm with a specially shaped receptacle for a modular drop-in trigger unit <NUM>, which is referred to below as the trigger pocket <NUM>. The trigger pocket <NUM> has a complementary shape to the modular drop-in trigger unit <NUM>, and accommodates it completely in the lower receiver <NUM>, with the trigger bar <NUM> protruding downward from the lower receiver <NUM>. In this context, complete accommodation is to be understood as meaning that the drop-in trigger unit <NUM> is arranged laterally and/or in the barrel direction <NUM> and underneath in the installed condition so that it is fixed, but detachable. This can be ensured in a relatively simple manner by a person skilled in the art by choosing appropriate fits and/or the choice of material for the lower receiver <NUM> and the trigger housing <NUM>. It has proven to be particularly advantageous if the lower receiver <NUM> and the trigger housing <NUM> are made of the same material, in particular a fiber-reinforced plastic.

<FIG> shows a lower receiver <NUM> in a side view with the sectional plane B-B. <FIG> shows a plan view of the lower receiver <NUM> with the modular drop-in trigger unit <NUM>, wherein the trigger housing <NUM> is shown for better visibility. <FIG> shows the section along the sectional plane B-B illustrated in <FIG> shows a section along the sectional plane C-C.

As can be seen in a synopsis of <FIG>, the trigger pocket <NUM> can have lateral guides <NUM> and front and rear boundaries <NUM> (cf. <FIG>) and is designed in a shape complementary to the trigger unit <NUM>. The lateral guides <NUM> as well as the front and rear boundaries <NUM> can be designed, for example, as surfaces, ribs, nipples, rails, notches, etc. and accordingly have, for example, a flat, linear or punctiform effect. The modular drop-in trigger unit <NUM> has a corresponding outer contour that is complementary in shape.

In the assembled state, the sides of the trigger unit <NUM> (or of the trigger housing <NUM>) are guided by the lateral guides <NUM> of the trigger pocket <NUM> and held in position. The front and rear ends of the trigger unit <NUM> (or the trigger housing <NUM>) can rest against the front and/or rear boundaries <NUM> and thus guided into the trigger pocket <NUM> and held in position. Furthermore, at least one trigger housing protrusion <NUM> (<FIG>) can be formed on the trigger housing <NUM> and can be received in a form-complementary trigger window <NUM>, which is formed on the trigger pocket <NUM> in the lower receiver <NUM>, so that the receiving surface <NUM> of the lower receiver <NUM> is the protrusion side surface <NUM> (<FIG>) of the trigger unit <NUM> (of the trigger housing <NUM>) and therefore guides and holds it in position. The receiving surface <NUM> and the protrusion side surface <NUM> lie close to one another and at least substantially seal the interior of the housing against external environmental influences.

The trigger housing protrusion <NUM> (<FIG>) can, as shown, be designed on both sides and, as in the embodiment shown, be rectangular, but other shapes such as a V-shape, U-shape, etc. are also possible.

The modular drop-in trigger unit <NUM> inserted in the trigger pocket <NUM> of the lower receiver <NUM> is thus positioned in the lower receiver <NUM> so that it cannot move in all directions except upward, and is also secured against upward movement in the installed condition by a retaining element in either the upper receiver <NUM> or the breech, and is thus fixed and immobile in the firearm's receiver <NUM>.

The modular structure allows the number of fire positions to be changed by, for example, exchanging the fire-control/safety selector <NUM>. Furthermore, the modular structure is advantageous, since by changing the trigger unit <NUM> it is possible to switch from a two-stage to a three-stage (pull-through) trigger quickly and without tools (and vice versa). There are also advantages in production because the modular drop-in trigger unit <NUM> according to the invention can be produced particularly efficiently due to a generally small number of parts, and the individual variants of the trigger can also be implemented by exchanging only a very limited number of parts. For example, it is conceivable to use a trigger lever <NUM> with a trigger rear <NUM> designed to accommodate the back end <NUM> and/or a disconnector <NUM> with a back end <NUM> (which then has no function) in a pull-through trigger. Likewise, in a two-stage trigger, both a (again functionless) limiter <NUM> and a sear <NUM> that is designed to interact with a rocker lever <NUM> (not necessary in the two-stage trigger) are conceivable. It is also possible to have the same shape of the locking lever <NUM> (with or without a spring-loaded plunger <NUM>) for either a rotary selector <NUM> or a sliding selector <NUM>.

This modular drop-in trigger unit <NUM> according to the invention can be exchanged without tools and therefore quickly and easily. If necessary, this modular drop-in trigger unit <NUM> represents an invention of its own, for example as defined below:
The invention relates to a trigger unit (<NUM>) for a firearm and is characterized in that it is designed as a drop-in trigger unit (<NUM>) to complement a trigger pocket (<NUM>) of a lower receiver (<NUM>) of the firearm, and that the trigger pocket (<NUM>) accommodates the trigger housing (<NUM>), preferably completely accommodates it.

It should also be noted that the trigger pocket (<NUM>) as a reference value for the "module," the drop-in trigger unit (<NUM>) is necessary in the definition without actually being part of the subject matter according to the invention. The term "accommodate" is understood here to mean that the trigger unit (<NUM>) is inserted (pushed) into the trigger pocket (<NUM>) in such a way that it only protrudes from the lower receiver (<NUM>) of the firearm with those parts for which the function of such a protrusion is necessary, and the term "fully" is intended to emphasize this; it is always a technical and not a mathematical-geometric approach.

In one embodiment it is provided that the trigger unit (<NUM>) has a hammer (<NUM>) which is rotatable mounted about a hammer axis (<NUM>) and can be biased by means of a hammer spring (<NUM>), wherein the hammer spring (<NUM>) has a first arm (<NUM>) and a second arm (<NUM>), a trigger lever (<NUM>) rotatable mounted about a trigger axis (<NUM>) which, preferably formed integrally with it, has a trigger bar (<NUM>) which, viewed in a normal direction (<NUM>), lies below the trigger axis (<NUM>) and is moved against a barrel direction (<NUM>) when the trigger bar (<NUM>) is actuated, wherein the trigger lever (<NUM>) has a trigger rear (<NUM>) that is designed to accommodate at least one disconnector (<NUM>), as well as a sear (<NUM>) rotatable mounted about a sear axis (<NUM>) and biased by means of a sear spring (<NUM>), wherein the hammer axis (<NUM>), the trigger axis (<NUM>) and the sear axis (<NUM>) are arranged parallel to one another and parallel to a transverse direction (<NUM>).

In another embodiment it is provided that the trigger housing (<NUM>) is formed with receptacles or bearings for the pins, shafts etc. (<NUM>, <NUM>, <NUM>) of the components (<NUM>, <NUM>, <NUM>, <NUM>) rotatable about the axes (<NUM>, <NUM>, <NUM>, <NUM>).

In yet another embodiment it is provided that laterally at least one trigger housing protrusion (<NUM>) is formed on the trigger housing (<NUM>) in the transverse direction (<NUM>).

The invention also relates to a trigger pocket (<NUM>) of a firearm, in particular in its lower receiver <NUM>, for a modular drop-in trigger unit (<NUM>) as defined above, wherein it is provided that the trigger pocket (<NUM>) has lateral guides (<NUM>) which support the trigger housing (<NUM>) and hold it in position.

In a further development the lateral guides (<NUM>) are designed as rails, nipples, or, preferably, flat.

In another development, the trigger pocket (<NUM>) has front and/or rear boundaries (<NUM>) that guide the trigger housing (<NUM>) and hold it in position.

In a further development the front and/or rear boundaries (<NUM>) are designed as a rail, nipple, or, preferably, flat.

In one embodiment of the last two developments it is provided that the trigger pocket (<NUM>) has a trigger window (<NUM>) with receiving surfaces (<NUM>) for receiving a trigger housing protrusion (<NUM>) with protrusion side surfaces (<NUM>), and.

This aspect of the invention also relates to a firearm with a breech, an upper receiver (<NUM>) and a lower receiver (<NUM>) with a trigger pocket (<NUM>) according to one of the preceding definitions, wherein a modular drop-in trigger unit (<NUM>) is secured against upward movement in the installed condition by the upper receiver (<NUM>) and/or the breech.

In the modular drop-in trigger unit (<NUM>) according to the invention, a trigger other than the one shown and described, including one already known from the prior art, can be provided because the mentioned advantages of such a drop-in trigger unit (<NUM>) can also be used with other triggers.

The invention is not limited to the illustrated and described exemplary embodiments, but can be modified and configured in various ways. In particular, the cross-sectional shapes shown in the illustrations of the mentioned receiver parts, pins, rails, recesses, etc. can be adapted to the given basic data, and the lengths and the positions with respect to the receiver can also be easily adapted by a person skilled in the art with knowledge of the invention. In particular, equivalent designs are obvious with knowledge of the invention and can be carried out without further ado by a person skilled in the art.

Principally, it has to be stated that, the number and possibilities of combinations of the individual embodiments described are not limited to the variants shown and described. Further, it is no problem for the person skilled in the art and knowing the invention to combine a detail of a first variant with one or more details of another variant or variants without sticking to (the) other details of the first variant! Free combinations of all details per se are possible without being mentioned here.

It should also be noted that, in the description and the claims, terms such as the "lower region" of an object, refer to the lower half and in particular the lower quarter of the overall height; "lowermost region" refers to the lowermost quarter, and in particular an even smaller part, while "central region" refers to the central third of the overall height. The use of the terms "width" or "length" apply mutatis mutandis. All of these terms have their generally accepted meanings applied to the intended position of the object under consideration.

In the description and the claims, the term "substantially" means a deviation of up to <NUM>% of the stated value, if physically possible, both downward and upward, otherwise only in the appropriate direction; in the case of degrees (angle and temperature), and for indications such as "parallel" or "normal," these terms mean ± <NUM>°. If there are terms such as "substantially constant," etc., what is meant is the technical possibility of deviation which the person skilled in the art takes as a basis and not a mathematical deviation. For example, a "substantially L-shaped cross-section" comprises two elongated surfaces, which merge at one end into the end of the other surface, and whose longitudinal extension is arranged at an angle of <NUM>° to <NUM>° to one another.

All given quantities and percentages, in particular those relating to the limitation of the invention, insofar as they do not relate to specific examples, are understood to have a tolerance of ± <NUM>%; accordingly, for example: <NUM>% means: from <NUM>% to <NUM>%. With terms such as "a holding means," the word "a" is not to be considered to represent a singular numeral ("one"), but rather is to be considered an indefinite article or pronoun, unless the context indicates otherwise.

The terms "combination" or "combinations" mean, unless otherwise stated, all types of combinations, starting from two of the relevant components up to a plurality or all of such components. The term "containing" also means "consisting of.

The features and variants stated in the individual embodiments and examples can easily be combined with those of the other examples and embodiments and, in particular, can be used for characterizing the invention in the claims without necessarily including the other details of the particular embodiment or of the particular example.

Claim 1:
Trigger unit (<NUM>) for a firearm that is designed as a drop-in trigger unit (<NUM>) to complement a trigger pocket (<NUM>) of the lower receiver (<NUM>) of the firearm, whereby the trigger pocket (<NUM>) is received by the trigger housing (<NUM>), preferably completely, characterized in that at least one housing protrusion (<NUM>) is formed laterally in the transverse direction (<NUM>) on the trigger housing (<NUM>) and in that the trigger pocket (<NUM>) has a trigger window (<NUM>) with receiving surfaces (<NUM>) for receiving a housing protrusion (<NUM>) with protrusion side surfaces (<NUM>), and
- that the receiving surfaces (<NUM>) are designed to complement the protrusion side surfaces (<NUM>),
- that the receiving surfaces (<NUM>) guides the protrusion side surfaces (<NUM>) and hold the trigger housing (<NUM>) in position, and
- that in the installed condition the receiving surfaces (<NUM>) and the protrusion side surfaces (<NUM>) lie against one another and thus seal the interior of the lower part of the receiver (<NUM>) from external environmental influences.