Patent Publication Number: US-9897402-B2

Title: Magazine well extension and trigger guard extension for a firearm

Description:
FIELD OF THE INVENTION 
     The present invention relates to accessories for firearms, and more specifically to a magazine well extension and trigger guard extension for firearms. 
     BACKGROUND OF THE INVENTION 
     Firearm magazines are typically inserted into a firearm via a magazine well (“magwell”), which typically has an opening that extends to the bottom side of the firearm. Magwells are often designed with strict tolerances in relation to the appropriate magazine, such that the magazine must be carefully aligned with the magwell opening before the magazine may be inserted into the magwell. During combat or other stressful situations, it can be difficult to replace the magazine quickly. 
     Known solutions to this problem are magazine well adapters that attach to a firearm and provide an enlarged opening and a “funnel” shape that assists the user with feeding the magazine into the magwell opening of the firearm. The sloped (feed) walls of known magwell extensions are subject to wear over time due to repeated contact with the magazine that is being fed into the magwell, and therefore in most cases the entire magwell extension must eventually be replaced. This presents a substantial cost burden because, in these devices, the entire assembly must be removed from the magwell and discarded. Further, many existing magwell extensions fit onto the magwell via a friction fit only. This requires magwell extensions to have very specific tolerances, thereby increasing their productions cost. 
     Further, for users with larger hands or that wear gloves while operating a firearm, the size and configuration of existing firearm trigger guard assemblies can be a hindrance to proper use of the firearm. 
     There is a continued need for improved magwell adapters that assist a firearm user in feeding a magazine into a magazine well of the firearm. Further, there is a need for devices that improve the trigger guard assemblies of existing firearms. 
     ASPECTS OF THE INVENTION 
     Additional aspects of the invention include: 
     Aspect 1: An extension for a firearm, the firearm comprising a lower receiver having a magazine well, a trigger guard, a rear trigger guard attachment point and a front trigger guard attachment point, the magazine well having a front side, a rear side and a bottom end comprising a first lower opening having a first area, the trigger guard having a front end and a rear end, the extension comprising: a first component; and a second component having a second lower opening that is monolithic; wherein one of the first and second components is shaped to engage front side of the magazine well when the first and second components are positioned around the bottom end of the magazine well and secured to each other and the other of the first and second components is shaped to engage the rear side of the magazine well when the first and second components are positioned around the bottom end of the magazine well. 
     Aspect 2: The extension of aspect 1, further comprising two fasteners, the first component including a first fastener-engaging member located on a left side of the lower receiver when the first and second components are secured to the bottom end of the magazine well and a second fastener-engaging member located on a right side of the lower receiver when the first and second components are secured to the bottom end of the magazine well, the second component including a third fastener-engaging member located on the left side of the lower receiver when the first and second components are secured to the bottom end of the magazine well and a fourth fastener-engaging member located on the right side of the lower receiver when the first and second components are secured to the bottom end of the magazine well, wherein the first and third fastener-engaging members are shaped and positioned to draw the first and second components together when the first fastener is tightened and the second and fourth fastener-engaging members are shaped and positioned to draw the first and second components together when the second fastener is tightened. 
     Aspect 3: The extension of any of the aspects 1-2, wherein at least one of the first and second components has a locating member that is shaped and positioned to engage a machined surface located on the lower receiver. 
     Aspect 4: The extension of any of the aspects 1-3, wherein the second lower opening has a second area that is larger than the first area. 
     Aspect 5: The extension of any of the aspects 1-4, one of the first component and second component further comprising at least one aperture that is positioned to be attached to the front end of the trigger guard without disconnecting the rear end of the trigger guard from the firearm. 
     Aspect 6: The extension of aspect 5, wherein the front end of the trigger guard is positioned lower when it is attached to at least one aperture and the extension is installed on the magazine well than when the front end of the trigger guard is attached to a front trigger guard attachment point of the lower receiver. 
     Aspect 7: The extension of any of the aspects 5-6, wherein one of the first component and second component further comprises at least one aperture that is positioned to engage with a hole located on the a front trigger guard attachment point when the extension is installed on the magazine well. 
     Aspect 8: The extension of any of the aspects 1-7, wherein one of an upper side of the second component and a lower side of the first component comprises at least one pin and the other of the upper side of the second component and a lower side of the first component comprises at least one groove, and the pin engages the groove when the extension is assembled. 
     Aspect 9: The extension of any of the aspects 1-7, wherein the second component has a plurality of walls that extend from the second lower opening to the first lower opening when the extension is installed on the magazine well so that when magazine is inserted into the magazine well or removed from the magazine well, the magazine does not come into contact with the first component. 
     Aspect 10: A method of modifying a firearm, the firearm comprising a lower receiver having a magazine well and at least one machined surface, the magazine well having a first lower opening, a front side and a rear side, the method comprising: providing a second lower opening that is located below the first lower opening by securing a first component a magazine well extension to a second component of the magazine well extension; and positioning the magazine well extension relative to the magazine well by engaging the at least one machined surface with a portion of the magazine well extension. 
     Aspect 11: The method of aspect 10, wherein the providing step further comprises providing a second lower opening that is larger than the first lower opening. 
     Aspect 12: The method of any of the aspects 10-11, wherein the positioning step further comprises positioning the magazine well extension relative to the magazine well by engaging a machined surface of a front trigger guard attachment point located on the lower receiver. 
     Aspect 13: The method of any of the aspects 10-12, wherein the positioning step further comprises positioning the magazine well extension relative to the magazine well by engaging the front side of the magazine well. 
     Aspect 14: A method of installing a magazine well extension onto a firearm, the firearm comprising a magazine well and a trigger guard, the magazine well having a bottom end comprising a flange, the flange having a lower surface and an opposing surface, the trigger guard having a front end and a rear end, the method comprising: attaching a first component of the magazine well extension to a second component of the magazine well extension; and attaching one of the first component or the second component to the flange. 
     Aspect 15: The method of aspect 14, further comprising tightening the magazine well extension against the flange by extending a member through a surface of at least one of the first component and the second component and into contact with the flange. 
     Aspect 16: The method of aspect 15, wherein the step of tightening the magazine well extension against the flange further comprises extending a threaded member through a surface of at least one of the first component and the second component such that it contacts the opposing surface of the flange. 
     Aspect 17: The method of any of the aspects 15-16, wherein the step of tightening the magazine well extension against the flange causes one of the first component and the second component to come into contact with the lower surface of the flange. 
     Aspect 18: The method of any of the aspects 14-17, further comprising sliding one of the first component and the second component over the flange from a front end of the flange. 
     Aspect 19: The method of aspect 18, further comprising sliding the other of the first component and the second component over the flange from a rear end of the flange. 
     Aspect 20: The method of any of the aspects 14-20, further comprising lowering a position of the front end of the trigger guard and attaching the front end of the trigger guard to one of the first component and the second component without detaching the rear end of the trigger guard from the firearm. 
     Aspect 21: The method of aspect 20, further comprising attaching one of the first component and second component to at least one aperture that is positioned to engage a hole located on the firearm to which the front end of the trigger guard is engaged when the magazine well extension is not installed on the magazine well. 
     Aspect 22: An extension for a magazine well of a firearm, the magazine well having a bottom end, the extension comprising: a component comprising an exterior surface and an interior surface, the interior surface including a slot that is sized and shaped to mate with the bottom end of the magazine well and at least one hole that passes through the flange-mounting mounting portion between the exterior surface and the interior surface; wherein when the component is attached to the magazine well via mating of the slot with the bottom end of the magazine well, a member can be passed through the at least one hole and into contact with the bottom end of the magazine well, thereby tightening the component against the magazine well. 
     Aspect 23: The extension of aspect 22, wherein the at least one hole and the member are threaded. 
     Aspect 24: An extension for a magazine well of a firearm, the magazine well having a bottom end comprising a flange and a well opening for receiving a magazine, the extension comprising: a flange-mounting component that is attachable to the flange of the magazine well and supports the extension from the magazine well when connected thereto; and a magazine-receiving component that is attachable to the flange-mounting component, the magazine-receiving component including a lower opening for receiving the magazine; wherein when the flange-mounting component is attached to the flange and the magazine-receiving component is attached to the flange-mounting component, a magazine-receiving passage is formed between the lower opening of the magazine-receiving component and the well opening of the magazine well of the firearm, wherein the flange-mounting component forms no portion of the magazine-receiving passage. 
     Aspect 25: The extension of aspect 24, wherein the lower opening in the magazine-receiving component has an area that is larger than an area of the well opening. 
     Aspect 26: The extension of aspect 25, wherein an upper opening in the magazine-receiving component has an area that is equal to the area of the well opening. 
     Aspect 27: An accessory for a firearm, the firearm comprising a magazine well and a trigger guard having a front end that is attachable to a front trigger guard mounting hole located on the firearm and a rear end that is attachable to a rear trigger guard mounting hole located on the firearm, the accessory comprising: a component that is attachable to the magazine well of the firearm, the component further comprising a first part that is attachable to the front trigger guard mounting hole and a second part that is attachable to the front end of the trigger guard; wherein when the component is attached to the magazine well, the first part is attached to the front trigger guard mounting hole, and the second part is attached to the front end of the trigger guard, the front end of the trigger guard is located below the front trigger guard mounting hole. 
     Aspect 28: The accessory of aspect 27, wherein the component is attachable to the magazine well of the firearm by sliding the component over a flange located on an exterior of a bottom end of the firearm. 
     Aspect 29: A method of expanding the area of a trigger opening of a firearm, the firearm comprising a magazine well and a trigger guard having a front end that has been detached from a front trigger guard mounting hole located on the firearm and a rear end that is attached to a rear trigger guard mounting hole located on the firearm, the method comprising: attaching a component to the magazine well, the component further comprising a first part that is attachable to the front trigger guard mounting hole and a second part that is attachable to the front end of the trigger guard; attaching the first part to the front trigger guard mounting; and attaching the second part to the front end of the trigger guard such that the front end of the trigger guard is located below the front trigger guard mounting hole. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The foregoing summary, as well as the following detailed description of the invention, will be better understood when read in conjunction with the appended drawings. For the purpose of illustrating the invention disclosed herein, certain embodiments in accordance with the herein disclosed invention are shown in the drawings. It should be understood, however, that the herein disclosed invention is not limited to the precise arrangements shown. It should also be understood that, in the drawings, the parts are not necessarily drawn to scale. The present invention will hereinafter be described in conjunction with the appended drawing figures, wherein like numerals denote like elements. In the drawings: 
         FIG. 1  is a front perspective view of a lower receiver and trigger guard assembly for a firearm in accordance with the prior art; 
         FIG. 2  is a partial exploded view of a first embodiment of a magazine well extension according to the present invention shown in relation to the prior art lower receiver and trigger guard assembly of  FIG. 1 ; 
         FIG. 3  is a left side perspective view of the embodiment of  FIG. 2  shown installed on the prior art lower receiver of  FIG. 1 ; 
         FIG. 4  is right side perspective view thereof; 
         FIG. 5  is a sectional view taken along line  5 - 5  of  FIG. 3 ; 
         FIG. 6  is an exploded view of the embodiment of  FIG. 2 ; 
         FIG. 7  is a bottom perspective view of the flange-mounting component of the embodiment of  FIG. 2 ; 
         FIG. 8  is a bottom perspective view of the magazine-receiving component of the embodiment of  FIG. 2 ; 
         FIG. 9  is a partial exploded view of the embodiment of  FIG. 2 , showing the bottom surfaces of components thereof; 
         FIG. 10  is an exploded view of a second embodiment of a magazine well extension according to the present invention; and 
         FIG. 11  is a bottom perspective view of the magazine-receiving component of the embodiment of  FIG. 10 . 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     The ensuing detailed description provides preferred exemplary embodiments only, and is not intended to limit the scope, applicability, or configuration of the herein disclosed inventions. Rather, the ensuing detailed description of the preferred exemplary embodiments will provide those skilled in the art with an enabling description for implementing the preferred exemplary embodiments in accordance with the herein disclosed invention. It should be understood that various changes may be made in the function and arrangement of elements without departing from the spirit and scope of the invention, as set forth in the appended claims. 
     To aid in describing the invention, directional terms may be used in the specification and claims to describe portions of the present invention (e.g., upper, lower, left, right, etc.). These directional definitions are merely intended to assist in describing and claiming the invention and are not intended to limit the invention in any way. When referring to an element that is a component of a firearm and unless otherwise specified, the front of a part of a firearm faces the barrel end of the firearm and the rear of a part of a firearm faces the butt-end of the firearm. 
     Reference numerals that are introduced in the specification in association with a drawing figure may be repeated in one or more subsequent figures without additional description in the specification in order to provide context for other features. 
     The term “monolithic” as used in the specification and claims means that the feature being described as monolithic is formed from a single piece of material, as opposed to being formed by the assembly of multiple parts. 
     Referring generally to  FIGS. 1-9 , an embodiment of a magazine well extension (hereinafter “magwell extension”)  40  that is attachable to a prior art lower receiver  2  of a firearm will be described in detail.  FIG. 1  shows a prior art lower receiver  2  of a firearm in accordance with the prior art. The lower receiver  2  shown in  FIG. 1  is from a model AR-15 rifle produced by Colt&#39;s Manufacturing Company of Hartford, Conn., U.S.A. It should be understood that the present invention could be adapted to be used with any number of firearm makes, models, and types, including but not limited to handguns, rifles, shotguns, and carbines, as will be discussed in further detail below. 
     The prior art lower receiver  2  shown in  FIG. 1  comprises a front side  3  that corresponds with the front (i.e., barrel) side of an assembled firearm, a rear side  4  that corresponds with the rear (i.e., buttstock) side of an assembled firearm, a grip-mounting portion  7  to which a handgrip may be attached, a trigger opening  5  having an area  6 , and a magazine well (hereinafter “magwell”)  9  into which a magazine is inserted. The magwell  9  includes a top end  10  (see  FIG. 3 ), a bottom end  11 , a lower opening  12  having an area  13 , an interior  14 , and an exterior  15 . Located around the bottom end  11  of the magwell  9 , on the exterior  15  thereof, is a flange  16  including a front portion  17  and a pair of side portions  18   a , 18   b.    
     Also shown in  FIG. 1  is a prior art trigger guard assembly  19  of the lower receiver  2 . The trigger guard assembly  19  comprises a trigger guard  20  that—in its standard configuration according to the prior art—is attached directly to the lower receiver  2  in two locations to complete the trigger opening  5 . As shown in  FIGS. 1 and 2 , in said standard position a front end  21  of the trigger guard  20  is attached to a front ear  24  via a spring-loaded pin  28  that is inserted into a hole  22  located at the front end  21  of the trigger guard  20 . The spring-loaded pin  28  includes a spring and a plunger or detent portion (not shown or labeled in  FIGS. 1-9 ). The detent portion extends into a throughhole  25  located in a front ear  24 . The lower receiver  2  also includes a front ear  26 , which is in contact with the opposing side of the front end  21  of the trigger guard  20 . The rear end  23  of the trigger guard  20  is attached to a pair of rear ears  29   a , 29   b  via a roll pin  31  that is inserted through a throughhole (not shown or labeled) that is located at the rear end  23  of the trigger guard  20  and pressed into throughholes  30   a , 30   b  that are located, respectively, in the rear ears  29   a , 29   b.    
       FIG. 2  is a partial exploded view showing the manner in which the magwell extension  40  according to the present invention is connected to the prior art magwell  9  and attached to the prior art trigger guard assembly  19 . In order to attach the trigger guard  20  to the magwell extension  40 , the spring-loaded pin  28  is depressed from the throughhole  25  and the front end  21  of the trigger guard  20  is rotated downwardly about the roll pin  31 , which remains installed in the trigger guard  20  and lower receiver  2 . The front end  21  of the trigger guard  20  is thus located below the front ears  24 , 26 . Once the magwell extension  40  has been installed over the portions  17 , 18   a , 18   b  of the flange  16 , as will be described in further detail below, the front end  21  of the trigger guard  20  is attached to a trigger guard attachment portion  42  of the magwell extension  40  via the spring-loaded pin  28 , which mates with a hole  98  located in a side of the trigger guard attachment portion  42 . The lower receiver  2  is further secured to the magwell extension  40  by attaching an ear attachment portion  44  of the magwell extension  40  to the front ear  24  via a spring-loaded pin, which is inserted into a hole  45  located on the ear attachment portion, and held in place within the hole  45  via a roll pin that is inserted through roll pin hole  46  located on the front side of the ear attachment portion  44  and perpendicularly enters the hole  45 . The embodiment of  FIG. 10  shows a roll pin  147 , a spring  148 , and a detent portion  149 . The spring  148  and detent portion  149  collectively comprise the spring-loaded pin that secures the ear attachment portion  144  to the front ear of the lower receiver  2 . It should be understood that the spring-loaded pin (including spring  148  and detent portion  149 ) and roll pin  147  of the embodiment of  FIGS. 10 and 11  are identical to the parts that are used in the embodiment of  FIGS. 1-9  to secure the ear attachment portion  44  to the front ear  24 . 
       FIGS. 3 and 4  show side views of the magwell extension  40  according to the present invention shown installed on the prior art AR-15 lower receiver  2 . As shown in these figures, when the magwell extension  40  is fully installed and the trigger guard  20  has been attached to the magwell extension  40  as discussed above, a trigger opening  5 ′ having an area  6 ′ is provided. The trigger opening  5 ′ has an area  6 ′ that is greater than the area  6  of the trigger opening  5  (see  FIG. 1 ). This provides the firearm user with additional volume within the trigger opening  5 ′ in which to insert their trigger finger. In this way, the magwell extension  40  provides a trigger guard extension that is an improvement over known prior art trigger guard assemblies. 
     As shown in  FIGS. 5-9 , the magwell extension  40  comprises two primary parts, a flange-mounting component  80  that attaches directly to the flange  16  of the magwell  9  of the lower receiver  2 , and a magazine-receiving component  50  that attaches to the flange-mounting component  80 . In this embodiment, the magazine-receiving component  50  is not directly attached to the magwell  9  of the lower receiver  2 , but rather indirectly attached via the flange-mounting component  80 . 
     As is understood by one of ordinary skill in the art, the sloped (feed) walls of magwell extensions are wear components. In other words, these parts are subject to wear over time due to repeated contact with the magazine that is being fed into and removed from the magwell, and therefore the magwell extension must eventually be replaced. Because many existing magwell extensions are of single-piece construction, replacement presents a substantial cost burden because the entire assembly must be removed from the magwell and discarded. The magwell extension  40  according to the present invention addresses this drawback with prior art magwell extensions by providing the two-part construction discussed herein. In the embodiment of the magwell extension  40  described herein and shown in the accompanying figures, the flange-mounting component  80  is not contacted by the magazine during normal use when the magazine is being inserted into the magwell  9  of the lower receiver, and therefore is not subject to wear that would require its eventual replacement. The magazine-receiving component  50  is the only wear component of the magwell extension  40 , and is thus the only part of the magwell extension  40  that will eventually require replacement. Thus, because the magazine-receiving component  50  is only a portion of the magwell extension  40 , the costs associated with replacing this part are less than the costs associated with replacing the entire magwell extension  40 . 
     As noted above, the present invention may be used with many different firearms. Different firearm models have different magwell sizes, shapes, and configurations, and therefore it is difficult to design a magwell extension that is universal across all firearm platforms. Accordingly, in the present invention, while the size and shape of specific embodiments of the flange-mounting component  80  must be chosen such that it can be securely attached to the lower receiver(s) with which it is designed to be used, the magazine-receiving component  50  may be designed to fit across a range of firearm platforms, such that one version of the magazine-receiving component could be used with more than one version of the flange-mounting component  80 . This reduces the need for users to keep multiple versions of this wear component on hand, and also reduces design and manufacturing costs. 
     Referring back to  FIGS. 1-9 , in this embodiment the flange-mounting component  80  comprises a rail  88  located at the bottom side thereof, a sloped surface  92  located towards the top side thereof, and a slot  90  oriented vertically between the rail  88  and the sloped surface  92 . Each of the rail  88 , slot  90 , and sloped surface  92  wrap around the three interior sides of the flange-mounting component  80 . The slot  90  and sloped surface  92  are sized and shaped so as to approximately accommodate the placement of the flange-mounting component  80  over the front portion  17  and side portions  18   a , 18   b  of the flange  16  of the magwell  9  of the lower receiver  2 . The slot  90  is aligned with the side portions  18   a , 18   b , and the flange-mounting component  80  is moved in a direction towards the rear side  4  of the lower receiver  2 , as approximately shown in  FIG. 2 . 
     Many known magwell extensions are attached to the flange of a magwell via a friction fit only. This requires that the magwell extensions have very careful tolerances so that the magwell extension does not work itself loose during use of the firearm. This increases the costs of manufacturing these devices. Further, due to repeated usage and vibration of the firearm, friction fits alone may be inadequate to maintain accessories attached to a firearm. In order to address this problem, in the embodiment of the magwell extension  40  described herein and shown in  FIGS. 1-9 , the flange-mounting component  80  is tightened against the side portions  18   a , 18   b  of the flange  16  of the magwell  9  of the lower receiver  2  via set screws  97   a , 97   b  that are each inserted into a respective threaded hole  96   a , 96   b  located in the flange-mounting component  80  and tightened against a respective side portion  18   a , 18   b  of the flange  16  of the magwell  9 . In alternate embodiments, other threaded members could be used in the place of the set screws  97   a , 97   b  in order to tighten the flange-mounting component  80  against the flange  16 . 
     In this embodiment, the magazine-receiving component  50  comprises an upper opening  52  and a lower opening  68  that opposes the upper opening  52 . The upper opening  52  extends to a top surface  53  of the magazine-receiving component  50 . The lower opening  68  has an area  69 . The area (not labeled) of the upper opening  52  is equal or approximately equal to the area  13  of the lower opening  12  of the magwell  9 . The magazine-receiving component  50  further comprises a seating surface  57  that comes into contact with a bottom surface  94  of the flange-mounting component  80  when the magazine-receiving component  50  is attached to the flange-mounting component  80  and a lip  59  that defines a groove  61  located between the lip  59  and the seating surface  57 . The seating surface  57  opposes a bottom surface  62  of the magazine-receiving component  50 . When the flange-mounting component  80  and magazine-receiving component  50  are fitted together, the slot  90  accommodates placement of the lip  59  therein, and the rail  88  fits within the groove  61 . The flange-mounting component  80  and magazine-receiving component  50  are then securely attached together by passing connecting bolts  72   a , 72   b  through throughholes  55   a , 55   b  located in bosses  54   a , 54   b  extending from the magazine-receiving component  50  and into threaded holes  86   a , 86   b  located in the flange-mounting component  80 . 
     When the magazine-receiving component  50  and the flange-mounting component  80  are attached together to form the magwell extension  40 , spaces  43   a , 43   b  are formed on the interior of the magwell extension  40  that approximately correspond with the side portions  18   a , 18   b  of the flange  16 , and an additional space (not shown) is formed on the interior of the magwell extension  40  that approximately corresponds with the front portion  17  of the flange  16 . As noted above, the set screws  97   a , 97   b  engage the respective side portions  18   a , 18   b  of the flange  16  at an angle, thereby preventing downward movement of the magwell extension  40 . Further, placement of the top surface  53  of the magazine-receiving component  50  just below the flange  16  prevents upward movement of the magwell extension  40 , once installed on the magwell  9 . These components maintain the position of the magwell extension  40  on the bottom end  11  of the magwell  9 . 
     As noted above, the magazine-receiving component  50  has a lower opening  68  through which the magazine is inserted when the user desires to load the magazine into the magwell  9  of the firearm. In this embodiment, the area  69  of this lower opening  68  is greater than the area  13  of the magwell  9 . This enlarged feed area, coupled with a front sloped wall  65 , a rear sloped wall  66 , and a pair of side sloped walls  64   a , 64   b  that angle between the lower opening  68  and the upper opening  52  of the magazine-receiving component  50 —the latter of which is adjacent to and aligned with the lower opening  12  of the magwell  9 —aid the user in feeding a magazine into the interior  14  of the magwell  9 . As a magazine is placed into the lower opening  68  and pressed upwardly, if not already aligned with the magwell  9  it will ride along one or more of the sloped walls  64   a , 64   b , 65 , 66  and enter the magwell  9  via the upper opening  52  of the magazine-receiving component  50 . In this way, the user can more quickly load a new magazine into the firearm. 
     As can be seen in  FIG. 4 , the entire lower opening  68  is defined by the structure of the magazine-receiving component  50 . This enables the lower opening  68  to be monolithic, which improves both the performance and durability of the magwell extension  40 . 
     A second embodiment of a magwell extension  140  according to the present invention is shown in  FIGS. 10 and 11 . In this embodiment, elements shared with the first embodiment (magwell extension  40 ) are represented by reference numerals increased by a value of 100. For example, ear attachment portion  44  in  FIG. 6  corresponds to ear attachment portion  144  in  FIG. 10 . In the interest of brevity, some features of this embodiment that are shared with the first embodiment are numbered in  FIGS. 10 and 11 , but are not discussed in the specification. 
     In the embodiment of  FIGS. 10 and 11 , the set screws and the threaded holes that are located on the top surface of the flange-mounting component  80  of the first embodiment are omitted. In alternate embodiments according to the embodiment of  FIGS. 10 and 11 , the set screws and threaded holes could be included. In the embodiment of  FIGS. 10 and 11 , a pair of pin holes  151   a , 151   b  are provided in the magazine-receiving component  150  into which a pair of pins  181   a , 181   b  are seated. As shown in  FIG. 11 , in this embodiment the flange-mounting component  180  includes a pair of pin grooves  182   a , 182   b  on the bottom side thereof. When the flange-mounting component  180  is slid onto the magazine-receiving component  150 , the pin grooves  182   a , 182   b  receive the pins  181   a , 181   b  therein. The interaction of the pins  181   a , 181   b  and the pin grooves  182   a , 182   b  helps to maintain the vertical alignment between the flange-mounting component  180  and the magazine-receiving component  150 . It should be understood that the pin holes, pins, and pin grooves could also be provided in alternate embodiments according to the embodiment of  FIGS. 1-9 . 
     In the embodiment of  FIGS. 10 and 11 , the magazine-receiving component  150  has a cutout  199  on the rear side thereof in the vicinity of the hole  198 , in order to provide access to the hole  198 . It should be understood that this cutout  199  could also be provided in alternate embodiments according to the embodiment of  FIGS. 1-9 . 
     As summarized above,  FIG. 10  illustrates the roll pin  147 , which is inserted into the roll pin hole  146  in order to maintain the spring-loaded pin (which is comprised of spring  148  and detent portion  149 ) within the ear attachment portion  144  of the magazine-receiving component  150 . A flanged portion  153  of the detent portion  149  is sized larger than the throughhole  145  so that once the detent portion  149  and spring  148  have been placed into the throughhole  145  and the roll pin  147  has been inserted into the roll pin hole  146  as shown in  FIG. 10  such that it engages the throughhole  145 , the spring-loaded pin is held captive within the throughhole  145 . The detent portion  149  is thus depressible within the hole  145 , in order to disengage the spring-loaded pin from the lower receiver  2 . 
     It should be appreciated that the foregoing is presented by way of illustration only, and not by way of any limitation, and that various alternatives and modifications may be made to the illustrated embodiments without departing from the spirit and scope of the present invention.