# Patent

## Title
Weapons system construction and modification including improved gas management system

## Abstract

This invention is directed to a rifle barrel sleeve system for a gas operated weapon system comprising: a rear sleeve surrounding a rear portion of the rifle barrel; a front sleeve surrounding a front portion of the rifle barrel; a gas elbow support surrounding the rifle barrel disposed between the rear sleeve and the front sleeve having a gas chamber allowing gas to escape from a barrel gas port into the gas elbow; and, a void defined between the rear sleeve, front sleeve, gas elbow and barrel having filler material.

## Background
CLAIM OF PRIORITY
This application is a continuation in part of U.S. patent application Ser. No. 13/106,171 filed May 12, 2011 which claims priority on U.S. Patent Application Ser. No. 61/334,024, filed May 12, 2010, both of which are incorporated by reference.


FIELD OF THE INVENTION
This invention is directed to a weapons system having a rifle, shotgun or cannon barrel and more particularly to a gas operated weapons system. This invention is directed to the construction of a rifle, shotgun or cannon barrel and method of modification providing a sandwich barrel design for reducing heat and harmonics and for improving accuracy. The improved gas management system is combined with the modified gun barrel of the present invention to reduce flex and harmonics while providing for adjustable gas return levels in the tube for improved accuracy and control.
BACKGROUND
It has been long understood that a rifle's barrel changes shape and moves in multiple directions every time the rifle is fired. This effect is also found in shotgun and cannon barrels. In some instances, this movement of the barrel has been coined “barrel whip” and is when a weighted object (bullet) travels down the tubular barrel under intense gas pressure generally defined as when the barrel away from its “static” state. Barrel whip can occur when the bullet accelerates into a rapid spin, when the stock drops significantly so the muzzle rises when the rifle is fired, or when a pressure wave travels the length of the barrel. In the case of shotguns and unrifled cannon barrels, the “barrel whip” largely results from the pressure wave traveling along the barrel.
Barrel whip reduces the accuracy of the projectile expelled from the barrel and, therefore, the ability of a shooter to hit a target. Historically, manufacturers of barrels have simply accepted that the barrel's movement can't be eliminated. The remedy was to manufacture the barrel so that at least the movement was consistent with each shot. With a combination of cartridge loads and a consistently moving barrel whip, a rifle can be made more accurate by matching the load with the barrel. However, this requires that cartridge loads be customized to match each individual barrel and requires a high degree of customization.
Further, with each shot, the chamber can swell and produce an annular wave that travels between the muzzle and the breech. As the annular wave travels down the barrel, the bore diameter changes slightly as a result of the wave. If the bullet exits the barrel coincidentally with the wave at the muzzle, the bullet accuracy is greatly reduced since the bore and the bullet will be ejected through a bore that is made larger due to the wave. Traditional attempts to avoid this problem have been to change the cartridge load so that the bullet does not exit the barrel when the annular wave is at the muzzle. Again, this involves a high degree of customization and requires that cartridge loads match each individual barrel.
Further, as rounds are shot through a barrel, the barrel heats and the metal expands, becomes more flexible, and, therefore, the effect of barrel whip and any annular waves increases. Some tests have found that the center of the bore can change as much as 0.001 inches between the barrel temperatures of 77° F. (ambient) and 122° F. While the number of rounds that it takes to heat a barrel from ambient to over 120° F. varies greatly with the type for round, the type of barrel and other factors, such temperature changes can occur in as little as four or five rounds. Therefore, for multiple shots, the heat generated by the shots can adversely affect the accuracy of the barrel. This effect is exemplified in FIG. 4.
An additional problem arises in weapon systems that utilize gas return mechanisms to capture escaping gas from the barrel and redirect the gas into the action to cycle the bolt for filing the next round. Typically, a rifle with a gas management system, such as an AR15/M4 platform which includes a gas exit port disposed along the length of the barrel, and in some cases, is part of the front sight assembly. A metal tube is connected to the port and runs back along the length of the barrel and into the action of the rifle. As a bullet is fired down the barrel, gas is forced into the tube and then into the action to help cycle the bolt to fire the next round. In current designs, however, the gas return tube is free floating along the length of the barrel and only secured at its distal ends. A problem arises in that when gas is forced into the tube, it can cause the tube to flex and create additional harmonics that interact with the barrel whip described above. Thus, an additional loss of accuracy is suffered in these weapon systems.
Accordingly, it is an object of the present invention to provide a weapons system that was manufactured or modified to reduce the effects of barrel whip, annular or pressure waves, and heat produced when firing.
It is a further object of the present invention to provide a gas management system for a weapon system that reduces flex and harmonics associated with a gas return tube to improve accuracy while maintaining the benefits of a gas management system.
It is a further object of the present invention to provide a control mechanism to adjust the flow of gas return to the action.
SUMMARY OF THE INVENTION
The present invention is accomplished by providing a rifle barrel having a gas port for a gas operated weapon system comprising: a forward gas redirection tube operably associated to the rifle barrel so that expelled gas from a cartridge travels out of the gas port and into the forward gas redirection tube; a rear gas connector operably associated with the forward gas redirection tube for receiving expelled gas traveling in the forward gas redirection tube; a rear gas redirection tube removeably connected to the rear gas connector for receiving expelled gas and transferring the gas to the action of the weapons system to assist with the cycling of the weapons system action.
A sleeve is arranged around the rifle barrel defining a void between the rifle barrel and the sleeve; filler material carried in the void defined between the rifle barrel and the sleeve wherein the forward gas redirection tube is disposed within the filler material between the sleeve and the barrel.
The invention can include a rear opening defined in the sleeve for receiving the rear gas connector wherein the rear gas connector is at least a portion of the rear gas connector is disposed between the rifle barrel and the sleeve, a forward gas connector connected to the rifle barrel so that expelled gas enter the forward rifle gas connector and the forward gas connector receives the forward gas redirection tube to redirect expelled gas toward the action of the weapon system, a lock pin for securing the rear gas redirection tube to the rear gas connector, and a control mechanism for regulating the amount of gas that can pass through the rear gas connector.
The invention can include grooves defined in the barrel for receiving filler material. An end cap can be carried by the sleeve and further defining the void disposed between the rifle barrel and the sleeve and for reducing expelled gas from the muzzle of the rifle barrel from entering the void. Threads can be carried by the end cap for securing accessories to the sleeve. The rear gas connector can be connected to the rifle barrel and/or to the sleeve.
The invention can also include a barrel sleeve system including a barrel having a gas port for a gas operated weapon system comprising: a rear sleeve surrounding a rear portion of the rifle barrel; a front sleeve surrounding a front portion of the rifle barrel; a gas elbow support surrounding the rifle barrel disposed between the rear sleeve and the front sleeve having a gas chamber allowing gas to escape from a barrel gas port into the gas elbow; and, a void defined between the rear sleeve, front sleeve, gas elbow and barrel having filler material disposed in the void.
The invention can also include filler material that includes material taken from the group consisting of: hydraulic cement, at least 50% by weight of calcium sulfate, 48% of less by weight of portland cement, epoxy, resin, graphite and metal particles. The invention can include a chamber bushing surrounding the rifle barrel adjacent to a shoulder sleeve stop, an end cap attached to the distal end of the front sleeve, a gas tube attached to the gas elbow for receiving gas from the barrel and directed the gas into a receiver of the rifle. The gas tube can be straight.
The invention can also include scoring lines disposed on the interior surface of the rear sleeve, front sleeve, or gas elbow.



DESCRIPTION OF THE DRAWINGS
The construction designed to carry out the invention will hereinafter be described, together with other features thereof. The invention will be more readily understood from a reading of the following specification and by reference to the accompanying drawings forming a part thereof, wherein an example of the invention is shown and wherein:
FIG. 1A is a side view of the prior art;
FIGS. 1B and 1C are perspective views of the prior art;
FIG. 1D is a perspective view of the invention;
FIG. 1E is a perspective view of the prior art;
FIG. 1F is a muzzle view of the prior art;
FIGS. 2A through 2F are schematics illustrating the need for the invention;
FIGS. 3A and 3B are schematics illustrating the need and results of the invention;
FIG. 4 is a chart illustrating heat building in a barrel;
FIGS. 5A through 5C are schematics of the invention;
FIGS. 6A through 6E are schematics of the invention;
FIG. 7 is a flowchart illustrating the invention;
FIG. 8 is a schematic of the invention;
FIGS. 9A and 9B illustrate aspects of the invention;
FIGS. 10A and 10B illustrate aspects of the invention;
FIGS. 11A through 11C illustrate the prior art;
FIG. 12 illustrates aspects of the invention;
FIG. 13A is an exploded view of components of the invention;
FIG. 13B is a assembled view of components of the invention;
FIG. 14 is a cross-sectional view of a component of the invention.



It will be understood by those skilled in the art that one or more aspects of this invention can meet certain objectives, while one or more other aspects can meet certain other objectives. Each objective may not apply equally, in all its respects, to every aspect of this invention. As such, the preceding objects can be viewed in the alternative with respect to any one aspect of this invention. These and other objects and features of the invention will become more fully apparent when the following detailed description is read in conjunction with the accompanying figures and examples. However, it is to be understood that both the foregoing summary of the invention and the following detailed description are of a preferred embodiment and not restrictive of the invention or other alternate embodiments of the invention. In particular, while the invention is described herein with reference to a number of specific embodiments, it will be appreciated that the description is illustrative of the invention and is not constructed as limiting of the invention. Various modifications and applications may occur to those who are skilled in the art, without departing from the spirit and the scope of the invention, as described by the appended claims. Likewise, other objects, features, benefits and advantages of the present invention will be apparent from the summary and certain embodiments described below, and will be readily apparent to those skilled in the art. Such objects, features, benefits and advantages will be apparent from the above in conjunction with the accompanying examples, data, figures and all reasonable inferences to be drawn there from, alone or with consideration of any references incorporated herein.
DETAILED DESCRIPTION OF THE INVENTION
Referring to FIG. 1A through 1F, a barrel 10 is shown attached to a gas operated reloading weapon. For example, the AR15 or M4 model rifle is a popular gas operated weapon system. Generally, such weapons systems include a barrel 10 having a receiver 12 and muzzle 14. Round 18a (FIG. 1E), which may be a shotgun shell containing multiple shot or a single slug projectile cartridge round, is received by barrel 10. Rounds can be inserted either individually into the breech or through a magazine configuration 20 for holding multiple rounds as is well known to those skilled in the art. In the magazine configuration, the rounds are biased in a direction such as shown by 22 so that when the action of the rifle or shotgun is cycled, rounds are inserted into the breech and can be filed. The barrel defines a bore 24 (FIG. 1B). The bore can be a smooth bore, such as in a shotgun or cannon, or contain rifling as is common in most rifles and smaller single projectile fire arms such as handguns.
In one embodiment, gas tube 11 is included in the gas operated weapon system. The gas tube receives gas that travels the barrel down the bore, out the gas port in and toward the action where it is expelled to assist the bolt to be pushed backward to cycle the next round in the magazine. Traditionally in a gas operated or gas assisted action the system utilizes gas from the expended cartridge to assist the operation of and the complete cycling of the bolt. Gas block 13 (FIG. 1C) is placed around the barrel so that an opening defined in the gas block aligns with an opening in the barrel to allow escaping gas to enter the gas block. The gas tube is received by the opening in the gas block and allows the escaping gas to be directed rearward to the action. In one embodiment, the gas tube is contained within a hand guard 15 (FIG. 10). However, when the action cycles, force is exerted on the gas tube in a forward direction which is transferred to the barrel at the gas block location causing the barrel to move. The barrel which is farthest from the action is the most flexible so that the closer to the muzzle the gas block is located the greater the effect of the action cycle in flexing the barrel.
Referring to FIG. 1D, the present invention includes a forward gas connector 21 having an opening defined in the forward gas connector which allows escaping gas to travel down a forward gas redirection tube 23 and into rear gas connector 25. The rear gas connector includes an opening defined in the rear gas connector for receiving gas redirection tube 23 in one end and receiving rear gas redirection tube 27 at the other end. The rear gas connector can include a second opening for receiving a locking pin. The rear gas redirection tube can include an opening in one end for receiving a locking pin so that when the rear gas redirection tube is received by the rear gas connector, the action gas redirection tube is secured to the rear gas connector. The forward and rear gas connectors can be welded or otherwise affixed to barrel 10. The forward gas connector, forward gas redirection tube and rear gas connector are cooperatively assembled to form a gas return assembly. The rear gas redirection tube can them be operatively connected to the gas return assembly when assembling or disassembling the weapons system.
Referring to FIGS. 2A through 2E, a cartridge (or shotgun shell/round) 26 is shown having case 28 and bullet 30. In the case of a shotgun, bullet 30 may be a single projectile (slug) or a plurality of small projectiles commonly referred to as shot. The construction of shotgun shells is well known to those skilled in the art and thus not specifically illustrated. It should be understood by those of ordinary skill in the art that the present invention is applicable to any and all weapons systems utilizing a barrel to eject a projectile(s) regardless of the form of the round or number of projectiles contained in a single cartridge. Case 28 can contain gunpowder or other explosives that when ignited, expands and pushes the bullet through the bore. In the case where the bore contains rifling, the bullet is caused to rotate in a direction illustrated as 32 which causes the bullet to spin within and upon leaving the bore. When the bullet is pushed out the bore, torque is applied to the barrel and the barrel can experience barrel whip shown as 34. As previously explained, barrel whip adversely impacts the accuracy of the barrel as the bullet can leave the muzzle when the bore is “off target.” It should be noted that the barrel whip can be in a linear direction or circular so that the barrel can whip in two or three dimensions.
Referring to FIG. 2D, the expanding gas from the ignited explosive can create an annular wave 36 that initially travels in a direction 38 down the barrel and will rebound in a direction opposite 38 and “bounce” back and forth for some period of time along the barrel. When the annular wave reaches the muzzle, the muzzle of the barrel can “whip” so that the bore moves “off target”. This effect is particularly undesirable when bullet 30 and annular wave 38 reach the muzzle approximately contemporaneously. The barrel whip effect is equally undesirable in smooth bore barrel weapons such as shotguns and cannons.
Referring to FIG. 2F, when the annular wave travels down a barrel containing a traditional gas block, the annular wave can further vibrate the barrel as the gas block is effected by the same. Further, the annular wave can be magnified if the forces exerted on the gas tube from the operation of the action are imparted to the barrel at point 17 due to the physical contact and force being transferred from the gas tube to the gas block to the barrel. When multiple rounds are fired and the barrel temperature rises as shown in FIG. 4, the “barrel whip” is magnified.
Given the multiple undesirable forces on the barrel, the accuracy of any rifle, shotgun or cannon is significantly compromised, particularly after multiple rounds are fired in relatively quick succession. Referring to FIGS. 3A and 3B, the results of a rifle barrel that has not been modified or manufactured with the present invention is illustrated as 40. Once the invention was applied to the above rifle barrels, the results are illustrated as 42 showing a significant improvement in accuracy.
Referring to FIGS. 5A through 5E, the invention's application and construction will be described in more detail. A sleeve 44 is placed over barrel 10 of a rifle with the forward gas connector, forward gas redirection tube and rear gas connector that are carried by the barrel. Sleeve 44 defines a muzzle sleeve opening 46 and a breech sleeve opening 48. In one embodiment, the breech opening is proximate to the barrel nut so that the sleeve approximately seals around the barrel enclosing the forward gas connector, forward gas redirection tube and at least a portion of the rear gas connector. In one embodiment, the sleeve fits generally flush with the barrel nut and has a diameter less than the barrel nut.
Referring to FIGS. 10A and 10B, a barrel nut 90 can be modified to include a sleeve receiving area 92 having an inner diameter greater than that of an unmodified barrel nut. The receiving area then receives the sleeve so that at least a portion of the is disposed inside the barrel nut as shown in FIG. 10B.
The sleeve and the outer boundary of the barrel define a void 50. In one embodiment the sleeve is manufactured from stainless steel. The sleeve can also be manufactured from other metals, composite plastics, or a fibrous material sufficient to maintain its structure while being exposed to the heat and vibrations of a weapons system barrel. The sleeve can be generally circular or polygonic in shape.
In one embodiment, the sleeve is generally twice the diameter of the rifle, shotgun or cannon barrel. In one embodiment, the barrel is machined to reduce the diameter of the barrel prior to installing the sleeve. This allows for the use of a smaller diameter sleeve and can assist with replacement of the modified barrel back in the stock of the rifle or other component of the weapons system. It should be noted that the sleeve need not be circular in shape and can be any shape including hexagon, oval, square and such.
In some configurations, it may be necessary to apply a sealant such as epoxy or putty at the sleeve breech opening so as to generate a seal between the sleeve and the barrel. Once the sleeve is in place, the barrel and sleeve are placed in a vertical position, in one embodiment as shown in FIGS. 6A through 6F. A barrel centering member 52 is used to center the barrel in the sleeve. In one embodiment, the barrel centering member 52 contains a distal member 54 that is received in bore 24. Spacing members 56a through 56c carried by spacing member 52 positions the barrel generally parallel to the center axis of the sleeve wherein the center axis of the sleeve coincides with the center axis of the barrel. It should be noted that placement of the barrel in the sleeve need not be exact to achieve the benefits of this invention.
In one embodiment, a realignment tool 84 is used to align the barrel in the sleeve. In this embodiment, the muzzle end 86 is placed in the bore of the barrel. The end cap or threads are placed on the muzzle end generally at 88 so that when the alignment tool is placed in the bore, the end cap or threads can be aligned with the sleeve. A muzzle brake can be placed generally at 90 over the alignment tool and attached to the end cap so that threads, muzzle brake and alignment tool, carried within the muzzle brake and tool, so that when the alignment tool is inserted into the bore, the barrel can be aligned within the sleeve, and the sleeve can be aligned with the tool and muzzle brake.
Once the sleeve is in place and the barrel is positioned with the sleeve, filler material 58 is placed in void 50 defined by the sleeve and the barrel. In the case of double barrel shotguns, the sleeve is constructed and arranged to enclose both barrels and the filler material 58 is then simultaneously placed in the void surrounding both barrels in the same manner as described above for a single barrel. In one embodiment, the filler material is a hydraulic type cement that when mixed with water will harden rapidly to produce a permanent bond. The filler material can be applied in a semi-fluid state and poured between the sleeve and the barrel.
In one embodiment the filler material is hydraulic cement comprising at least 50% calcium sulfate and 48% or less portland cement and may contain amorphous silica, alumina, limestone dust, clay, quartz, calcium hydroxide and calcium sulfo aluminate. In one embodiment the filler material is hydraulic cement comprising at least 90% calcium sulfate and 10% or less portland cement. The filler material can also be epoxy or resins that are able to withstand the heat generated from the firing of a barrel of a weapons system. In one embodiment, the filler material is mixed with metal to enhance the filler materials' ability to absorb and quickly dissipate heat from the barrel. In one embodiment, the metal is in the form of metal shavings. In one embodiment, the metal is in the form of a ellipsoid or sphere. In one embodiment, the metal is in particles with irregular shapes.
In one embodiment, a muzzle brake 60 can be installed after the sleeve and filler material have been installed. In one embodiment, an end cap 61 can be attached to the muzzle end of the sleeve. This end cap can be simply an end cap defining a center opening that is the same diameter of the bore of the barrel. The opening of the end cap can also be slightly larger than the barrel diameter. In one embodiment, the end cap has a threaded portion 65 that can receive a corresponding threaded portion (not shown) of a muzzle brake, or other attachment to attach the muzzle brake of other attachment to the threaded end cap which allows for its attachment and removal without having to attach or remove the end cap.
Referring to FIG. 7, the method of practicing this invention will be explained in more detail. The next step is to dissemble the weapon system and remove the barrel and gas tube at 62. The barrel can be de-greased and painted at 64. If the barrel diameter needs to be reduced at 66, the barrel is reduced at 68. In one embodiment, the barrel exterior surface is roughed to promote a more cohesive bond between the filler material and the barrel. Such roughing can be accomplished through the use of abrasive means such as sandpaper. The barrel can be re-crowned at 70. The barrel can also be painted at 70. In one embodiment, circumferential grooves, such as shown in FIG. 8, are cut into the barrel to provide larger void between the sleeve and the barrel for receiving filler material at 71. The gas return assembly is installed at 72.
The sleeve is measured and cut to the appropriate length based upon the barrel being modified. In one embodiment, the action end of the sleeve is beveled and squared so that it fits square against the action end of the barrel. A sleeve is placed over the barrel at 73. In one embodiment, the sleeve is pressed against the barrel using a press. If there is a gap between the sleeve breech opening and the barrel as determined at 74, the gap should be closed at 76. The action of the weapons system is locked and the muzzle centering device is installed at 78. The bore of the barrel is plugged and filler material is placed in the void defined by the barrel and the sleeve at 80 and the filler material is allowed to cure. In one embodiment, the twelve inches or so at the muzzle end of the sleeve is heated prior to the filler material curing. The external fittings are replaced at 82 which can include tightening the muzzle brake to ensure proper clocking (alignment), welding on the end cap, threads or muzzle brake. In one embodiment, clamps are used to secure the end cap, threads, or muzzle brake to the sleeve to assist with proper attachment when welding. The sleeve and some of the exposed portion of the barrel can be finished through painting, polishing, etc. The end cap, threads or muzzle brake, if used, have the center opening drilled to ensure that there is no grazing when a bullet leaves the muzzle of the rifle barrel. The sleeve can be marked for maximum caliber and the muzzle brake can be marked for the specific chambering of the rifle.
Referring to FIG. 8, a cross-section of the invention is shown. Barrel 10 can be milled or otherwise modified to include one or more grooves shown as 100a through 100d. These grooves, when included, define void 50. When the filler material is placed in void 50, the filler material is received by the grooves and results in the filler material more securely affixing to the barrel.
In one embodiment, the barrel includes original threads 102 which can be used to attach muzzle brake, suppresser or other accessory to the original barrel of the weapons system. When the barrel is received by sleeve 44, the original thread can be completely covered by the sleeve or can protrude from the muzzle end of the sleeve. An end cap 104 can be attached to the sleeve to further define void 50. The end cap can include end cap threads 106 for attaching a muzzle brake, suppers or other accessory. The end cap can cover the void at the muzzle end shown at 108 to prevent muzzle gases from entering the void area and interfering with or otherwise effecting the filler material. The end cap can be permanently affixed to the sleeve through welding or the like at point 110.
In one embodiment, the barrel can be milled down to reduce its diameter thereby reducing the overall weight of the weapons system. The combination of filler material and sleeve are sufficient to reinforce the barrel following removal of excess diameter material.
In one embodiment, a control mechanism, designated generally as 120 (FIG. 9A), is provided in rear gas connector for adjusting the flow of gas through interior channel 122. In the illustrated embodiment, when control mechanism is lowered on the interior channel, less gas is allowed to pass through to the action of the weapons system. In one embodiment, the control mechanism may be a screw threaded into rear gas connector so that rotation of the screw causes it to extend into or retract from the interior channel to adjust the flow of gas there through. Once sleeve 44 and the filler material are applied to barrel 10, in order to disconnect the barrel from the rest of the weapons system, rear gas redirection tube disconnects from the rear gas connector. In order to prevent accidental disconnect between the rear gas redirection tube and rear gas connector, a lock pin 124 can be provided which extends through rear gas connector and engages rear gas redirection tube so that it cannot be removed from rear gas connector accidentally. Retracting the lock pin allows the rear gas redirection tube to be withdrawn from the rear gas connector.
In one embodiment, forward gas redirection tube 23 includes an angled portion 126 (FIG. 9B) that is attached to the opening defined in the barrel for receiving expelled gas. This configuration removes the forward gas connector. When the forward gas redirection tube is received by the sleeve and surrounded by filler material, the forward gas redirection tube maintains sufficient structural integrity for operation of the weapons system.
Sleeve 44 can include a notch 130 (FIG. 5B) for receiving the rear gas connector when the sleeve is fitted over barrel 10. The rear gas connector then extends above sleeve 44 when mounted to barrel 10 for access to the lock pin and the control mechanism. Once the filler material is added, forward gas redirection tube is secured between sleeve 44 and barrel 10 to resist flexing and harmonic effect as gas is passed through the gas tubes. The forces applied to the rear redirection gas tube effect the rear gas connector near the chamber of the barrel thereby reducing the effects of the forces of the action cycling. Accordingly, the present invention can also eliminate the free floating gas return tube to further improve accuracy on rifles with gas management systems that return gas to the action to help cycle the bolt.
Referring to FIGS. 11A through 11C, barrels designed for the M4 or AR15® weapons platform as shown. Barrel 14 in FIG. 11A can include varying diameters such as 130a through 130g. A front sight with a gas block 132 can be included on the barrel. A gas tube 11 can be received into the front sight gas block and extend rearward away from the muzzle. As can be seen, the gas tube includes a first bend 140a and a second bend 140b so that the ends of the gas tube are parallel with the barrel, but the gas tube is able to be positioned so that it is received in the frontsight block and extends over the barrel nut. A handguard cap 134 can be included surrounding the barrel for receiving a handguard. A delta ring 136 can surround the barrel and operability cooperate with the handguard ring to assist with securing a handguard to the barrel. The gas tube can extend away from the muzzle across the barrel nut. Threads 138 can be included in the muzzle end of the barrel for securing items to the barrel such as sound suppressors and flash suppressors.
Referring to FIG. 12, the diameter of the barrel used in one embodiment of the present invention is generally uniform from the muzzle threads to before the barrel extension 142. A shoulder sleeve stop 144 is included in the barrel at a distance 146 from the barrel extension. A first diameter 148 is adjacent to the shoulder stop and adjacent to a second diameter of the barrel 150. The first diameter can taper into the second diameter of the barrel. A barrel gas port 152 is defined in the barrel so that gas from a fired cartridge can escape the barrel before the gas reaches the muzzle.
Referring to FIG. 13A, several components of one embodiment of the invention are shown in an exploded view. A rear sleeve 154 surrounds the barrel creating a rear void 156 between the barrel and the rear sleeve. This rear void can be filled with the filler media described above. The rear sleeve can be attached to a chamber bushing 158 which surrounds the barrel around the first diameter and abuts the shoulder sleeve stop. The chamber bushing and rear sleeve can be press fit, welded, glued, or otherwise secured to each other.
A gas elbow 160 includes smaller diameters at each end so that the rear portion 162 can be received into the rear sleeve. A front portion 164 also has a smaller diameter than the middle portion to be received in a front sleeve 166. The front sleeve and barrel define a front void 168 which can be filled with the filler material described above. End cap 61 can be attached to the front sleeve on one embodiment allowing the threads of the barrel to extend out of the end cap allowing a sound or flash suppressor to be attached to the muzzle end of the barrel. The gas elbow can include a gas block 21 that is in fluid communications with the barrel gas port so that gas escaping the barrel is transferred into a gas channel 168 defined in the gas elbow and can exit the gas elbow through the gas block. The escaping gas can then be redirected toward the action of the weapon platform by the gas tube. In one embodiment, the gas tube is straight without a first or second bend. This allows gas to be transmitted from the gas block to the action without the gas interacting with the bends of a traditional gas tube thereby reducing the movement of the gas tube and the barrel when gas is transmitted through the gas tube.
In one embodiment, an adjustment screw 170 is included in the gas elbow and penetrated into the gas chamber of the gas elbow so that when the adjustment screw extends into the gas chamber, less gas is allowed to enter the gas block. This allows the amount of gas transmitted back toward the action.
A gas tube retention pin 172 can be included which is inserted into retention pin opening 174 and through the gas tube securing the gas tube into the gas block. A mounting member 176 can be included to be received into a mounting opening 178 and secure the gas elbow to the barrel.
Referring to FIG. 13B, various components of the present invention are shown connected. In one embodiment, the end cap is replaced with a muzzle brake 60 or sound suppressor and can be attached to the protruding threads of the barrel.
Referring to FIG. 14, the gas elbow can include flow channels 180 a through 180 d which provide for fluid communications between the rear void and the front void. In one embodiment, the chamber bushing, rear sleeve, gas elbow, front sleeve are carried by the barrel. Filler material is placed in the front void and can flow through the flow channels into the rear void. A gas tube receiving opening 177 is defined in the gas elbow for receiving a gas tube.
While a preferred embodiment of the invention has been described using specific terms, such description is for illustrative purposes only, and it is to be understood that changes and variations may be made without departing from the spirit or scope of the following claims.

## Claims

1. A rifle barrel system including a barrel having a gas port for a gas operated weapon system comprising:
a rear sleeve surrounding a rear portion of the rifle barrel;
a front sleeve surrounding a front portion of the rifle barrel;
a gas elbow surrounding the rifle barrel disposed between said rear sleeve and said front sleeve having a gas chamber allowing gas to escape from a barrel gas port into said gas elbow; and,
filler material disposed between said rear sleeve, front sleeve, gas elbow and rifle barrel.

2. The system of claim 1 wherein said filler material includes material taken from the group consisting of: hydraulic cement, at least 50% by weight of calcium sulfate, 48% of less by weight of portland cement, epoxy, resin, graphite and metal particles.

3. The system of claim 1 including a chamber bushing surrounding said rifle barrel adjacent to a shoulder sleeve stop.

4. The system of claim 1 including an end cap attached to said distal end of said front sleeve.

5. The system of claim 1 including a gas tube attached to said gas elbow for receiving gas from said barrel and directing said gas into a receiver of the rifle.

6. The system of claim 5 wherein said gas tube is straight.

7. The system of claim 1 wherein said rear sleeve includes scoring lines disposed in the interior surface of said rear sleeve.

8. The system of claim 1 wherein said front sleeve includes scoring lines disposed in the interior surface of said front sleeve.

9. A barrel having a barrel gas port for a gas operated weapon system comprising:
an inner barrel having a bore and a barrel gas port allowing gas to escape through said barrel gas port when a cartridge is fired from said rifle barrel;
a rear sleeve surrounding a rear portion of said inner barrel;
a front sleeve surrounding a front portion of said inner barrel;
a gas elbow surrounding said inner barrel disposed between said rear sleeve and said front sleeve having a gas chamber allowing gas to escape from said barrel gas port into said gas elbow; and,
filler material disposed between said rear sleeve, front sleeve, gas elbow and barrel.

10. The barrel of claim 9 wherein said filler material includes material taken from the group consisting of: hydraulic cement, at least 50% by weight of calcium sulfate, 48% of less by weight of portland cement, epoxy, resin, graphite and metal particles.

11. The barrel of claim 9 including:
a gas tube receiving opening defined in said gas elbow; and,
a gas tube received into said gas tube receiving opening of said gas elbow for receiving gas from said barrel and directing said gas into a receiver of the rifle.

12. The barrel of claim 11 wherein said gas tube is disposed outside said rear sleeve.

13. The barrel of claim 11 wherein said gas tube receiving opening is aligned with a gas tube receiving port of a receiver of a rifle when said barrel is attached to said receiver.

14. A barrel system for a gas operated weapon comprising:
an inner barrel having a bore and a barrel gas port allowing gas to escape through said barrel gas port when a cartridge is fired from said rifle barrel;
a sleeve surrounding said rifle barrel;
a gas elbow included in said sleeve having a gas chamber allowing gas to escape from said barrel gas port into said gas elbow;
filler material disposed between said inner barrel and a rear portion of said sleeve and between said inner barrel and a front portion of said sleeve; and,
wherein said filler material includes material taken from the group consisting of: hydraulic cement, at least 50% by weight of calcium sulfate, 48% of less by weight of portland cement, epoxy, resin, graphite and metal particles.

15. The barrel system of claim 14 wherein said gas elbow includes flow channels allowing said rear void and said front void to be in fluid communication.

16. The barrel system of claim 14 including:
a gas tube receiving opening defined in said gas elbow; and, a gas tube received into said gas tube receiving opening of said gas elbow for receiving gas from said rifle barrel and directing said gas into a receiver of the rifle.

17. The barrel system of claim 16 wherein said gas tube is straight.

18. The barrel system of claim 14 including a chamber bushing surrounding said inner barrel and attached to a proximal end of said sleeve.

19. The barrel system of claim 14 including an end cap surrounding said inner barrel and attached to a distal end of said sleeve.

20. The barrel system of claim 14 including an adjustment screw rotatably received into said gas elbow so that the amount of gas entering the gas elbow can be modified by actuating said adjustment screw.