FIREARM MAGAZINE CAPACITY LIMITER
The firearm magazine capacity limiter selectively limits the capacity of the magazine to comply with applicable laws or regulations. The capacity limiter has a rod including a follower contact end and an opposite attachment end that secures removably in a passage provided through a closure plate at one end of the magazine. The rod may have any length desired to limit the maximum capacity of the magazine as desired. Various attachment configurations are provided, including threaded attachment, quarter turn attachment, and sliding attachment via a capture flange on the attachment end of the rod. The capacity limiter may be used with detachable box-type magazines where the closure plate is the floor plate of the magazine, or with tubular magazines where the closure plate is the forward plug at the end of the magazine.
This application claims the benefit of U.S. Provisional Patent Application Ser. No. 62/044,951, filed Sep. 2, 2014.
BACKGROUND OF THE INVENTION1. Field of the Invention
The present invention relates to ammunition magazines for multiple shot firearms, and particularly to a firearm magazine capacity limiter enabling the user to set or limit the maximum number of rounds or cartridges to be carried in the magazine.
2. Description of the Related Art
Most sporting firearms and handguns are capable of firing multiple shots before reloading if equipped with a magazine holding at least a few rounds of ammunition. This is true of semiautomatic hunting rifles, pump and semiautomatic shotguns, and many handguns. Detachable box-type magazines are generally capable of holding a relatively large number of rounds of ammunition, e.g., ten to thirty rounds in the case of many rifles. Even larger capacity magazines are available for many firearms. Even shotguns having tubular magazines are typically capable of holding perhaps five shells, more or less, depending upon the gun, if the magazine can receive its full capacity.
However, many jurisdictions and controlling bodies have laws or regulations controlling or limiting the number of shots that may be fired from a firearm before reloading. This may be due to hunting or game conservation laws or regulations, firearm protection laws, or for other reasons. While these various laws and regulations are generally consistent with one another, there can be some variation from state to state, region to region within a state, and even from season to season, and may be dependent upon the specific type of game being hunted. A firearm owner or user may have a firearm with a magazine capacity that is permissible under a given set of regulations or laws, but that may exceed the permissible capacity in other circumstances or areas, e.g., when traveling to a different state or area for hunting, or when hunting a different species of game.
Thus, a firearm magazine capacity limiter solving the aforementioned problems is desired.
SUMMARY OF THE INVENTIONThe firearm magazine capacity limiter comprises a rigid rod that is installed through a modified floor plate of a detachable box-type magazine, or through the forward cap of a tubular magazine. In the case of box-type magazines, the rod extends through the follower spring in the magazine to limit the travel of the follower, and thus limit the amount of ammunition that may be loaded into the magazine above the follower. In the case of tubular magazines, the rod extends generally axially through the tube to limit the number of shells that may be loaded into the tube.
A number of different attachment means may be used to secure the capacity limiter in the magazine. One embodiment provides a thickened boss having an internally threaded passage. The boss is installed in the floor plate of a box-type magazine or in the forward cap of a tubular magazine. The capacity limiter comprises a rigid rod with a follower contact end and an opposite magazine attachment end having an externally threaded portion that threads into the internally threaded boss of the magazine. Alternatively, the floor plate passage may be threaded and the thickened boss eliminated, if the plate is sufficiently thick to provide sufficient mounting strength for attachment of the rod,
Another embodiment has a keyhole-shaped flange that fits through a congruent passage in the floor plate or cap of the magazine. The flange has an extension that captures the edge of the passage of the magazine when turned through a partial revolution. Still another embodiment utilizes the keyhole-shaped passage, but provides a circular flange at the attachment end of the rod. The circular flange passes through the larger portion of the keyhole-shaped passage and slides laterally to capture the edge of the narrower extension of the keyhole-shaped passage between the circular flange and the outer portion of the attachment end of the rod.
Any of the above-described embodiments may be provided with capacity limiting rods of any desired length in order to limit the magazine capacity as needed or required by applicable laws and/or regulations.
These and other features of the present invention will become readily apparent upon further review of the following specification and drawings.
Similar reference characters denote corresponding features consistently throughout the attached drawings.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTSThe firearm magazine capacity limiter includes several embodiments, each comprising a rigid rod that is inserted into the magazine and extends through the internal volume of the magazine to limit the travel of the follower within the magazine. The limited travel of the follower, in turn, limits the number of cartridges or rounds of ammunition that may be placed in the magazine.
In the embodiment of
The primary difference between the three magazine capacity limiters 100a through 100c of
The magazine 150 of
The closure plate 254 of the magazine 250 has an unthreaded passage 264a formed therein having a slot 264b extending radially therefrom. The passage 264a and its slot 264b are substantially congruent to the bushing 222a and tab 222b of the magazine capacity limiter 200. The magazine capacity limiter 200 is secured in the magazine 250 by inserting the bushing 222a through the passage 264a of the magazine 250 with the tab 222b aligned with the slot 264b of the magazine 200 and above the closure plate 254. The capacity limiter 200 is then rotated through a partial revolution to position the tab 222b beyond the edge of the closure plate passage 264a and out of alignment with the slot 264b, thereby locking the magazine capacity limiter 200 in place in the magazine 250.
The closure plate 456 of the tubular magazine 450 comprises a cap having an externally threaded portion 458 adapted to thread into the internally threaded end 454 of the tubular magazine 450, and a larger diameter knob portion 460 extending concentrically therefrom. An internally threaded boss 462 extends concentrically from the knob 460, i.e., the knob 460 is located between the externally threaded portion 458 and the internally threaded boss 462.
The rod 412 is installed in the tubular magazine 450 by first threading the externally threaded portion 458 of the closure plate or cap 456 into the threaded end 454 of the magazine 450, and then threading the closure plate attachment fitting 420 into the internally threaded boss 462 of the closure plate or cap 456. The magazine insert rod 412 extends substantially concentrically down the tubular magazine 450 to limit the travel of a follower or shells placed in the magazine from its opposite end, as such magazines are conventionally loaded.
The closure plate attachment bushing 520 threads directly into the internally threaded end 454a of the tubular magazine 450. The rod 512 is installed in the tubular magazine 450 by threading the closure plate attachment bushing 520 into the internally threaded end 454a of the magazine 450. The external rim 454b of the magazine 450 serves as a limiting stop for the rod 512 in the magazine 450. The magazine insert rod 512 extends substantially concentrically down the tubular magazine 450 to limit the travel of a follower or shells placed in the magazine from its opposite end, as such magazines are conventionally loaded.
It is to be understood that the present invention is not limited to the embodiments described above, but encompasses any and all embodiments within the scope of the following claims.
Claims
1. A firearm magazine capacity limiter, comprising:
- at least one magazine insert rod having a follower contact end, a closure plate attachment end opposite the contact end, and a shaft defining a length between the follower contact end and the closure plate attachment end; and
- a firearm magazine having a loading end and an opposing end opposite the loading end, the magazine defining a compartment for holding ammunition between the loading end and the opposing end in a position ready for loading into a firing chamber, the opposing end having a mounting aperture defined therein, the magazine insert rod being selectively secured in the mounting aperture so that the shaft extends into the compartment in order to limit the quantity of ammunition loadable in the compartment.
2. The firearm magazine capacity limiter according to claim 1, wherein said at least one magazine insert rod comprises a plurality of interchangeable magazine insert rods, each of the magazine insert rods having a different length so that the capacity of the magazine may be selectively limited.
3. The firearm magazine capacity limiter according to claim 1, wherein said firearm magazine comprises a tubular magazine, the opposing end opposite the loading end being internally threaded, the limiter further comprising an externally threaded closure plate attachment bushing attached to the closure plate attachment end of said magazine insert rod, the bushing selectively engaging the internally threaded end of the tubular magazine.
4. The firearm magazine capacity limiter according to claim 1, wherein said firearm magazine comprises a box-shaped magazine, the opposing end opposite the loading end of said firearm magazine comprising a closure plate having the mounting aperture defined therein.
5. The firearm magazine capacity limiter according to claim 4, wherein:
- the closure plate attachment end of the rod is externally threaded; and
- the mounting aperture in the closure plate is internally threaded, the closure plate attachment end of the rod selectively engaging the mounting aperture of the opposing end of the magazine to secure the rod in the magazine.
6. The firearm magazine capacity limiter according to claim 4, further comprising:
- an internally threaded boss disposed in the mounting aperture defined in said closure plate; and
- an externally threaded fitting mounted on the closure plate attachment end of said rod, the fitting selectively engaging the boss to secure said rod in said magazine.
7. The firearm magazine capacity limiter according to claim 4, wherein the mounting aperture defined in said closure plate has a keyhole configuration, the limiter further comprising a bushing mounted on the closure plate attachment end of said rod, the bushing having a tab extending therefrom, the bushing and the tab defining a key insertable through the keyhole configuration of the mounting aperture, the key being rotatable in the keyhole to lock and unlock said rod in said magazine.
8. The firearm magazine capacity limiter according to claim 4, wherein the mounting aperture defined in said closure plate has a keyhole configuration, the limiter further comprising an annular flange mounted on the closure plate attachment end of said rod, the flange being insertable through the keyhole configuration of the mounting aperture and slidable in the keyhole so that the shaft of said rod forms a friction fit with the keyhole to selectively lock said rod in said magazine.
9. The firearm magazine capacity limiter according to claim 1, wherein said firearm magazine comprises a tubular magazine, the opposing end opposite the loading end being internally threaded, the limiter further comprising:
- an externally threaded bushing having an internally threaded bore extending axially through the bushing, the bushing defining a closure plate selectively engaging the internally threaded end of said magazine; and
- an externally threaded fitting attached to the closure plate attachment end of said magazine insert rod, the fitting selectively engaging the internally threaded bore of the closure plate to secure said rod in said magazine.
Type: Application
Filed: Aug 20, 2015
Publication Date: Mar 3, 2016
Inventors: KENNITH K. SHADE (HOBBS, NM), WILLIAM L. ALVES, II (HOBBS, NM)
Application Number: 14/831,703