IP Library › Granted Patent US 50,303
Granted Patent E1
US 50,303 · App. 17/839,327 · Granted Feb 18, 2025

Ammunition magazine

Inventors: Richard M. Fitzpatrick (West Lake Hills, TX); Michael T. Mayberry (Denver, CO); Brian L. Nakayama (Arvada, CO); Eric C. Burt (Broomfield, CO)
Assignee: Magpul Industries Corp.
F41A9/70F41A9/62F41A9/65F41A9/67F41A9/69F41A9/83
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Quick Facts
Patent No.
US 50,303
App. No.
17/839,327
Granted
Feb 18, 2025
Kind
E1
Abstract

The present invention is an ammunition magazine, preferably made of a reinforced polymer, utilizing a structurally enhancing ridge, angular guide rails and a follower made to interface with said guide rails to reduce wobble. The preferred embodiment also features a protective cover that distributes forces from the spring to more structurally sound areas of the magazine, thus reducing feed end splay, and an ammunition indication system comprised of at least one window and a noticeable marker on the follower spring. The follower and magazine casing are also designed to interface to prevent the follower from popping out of the feed end and the floor plate of the magazine utilizes a locking plate and sliding relationship between the floor plate, locking plate and magazine to secure the floor plate onto the magazine casing. The cover features built in tools for, among other things, unloading and disassembling the magazine.

Claims (37)

1. An ammunition magazine comprising:

a casing with fore and aft sides and two longer lateral sides longer than the fore and aft sides and first and second open ends, the casing further comprising guide rails running along insides of the longer lateral sides, the casing further comprising a stop tab projecting internally from a front of the casing; and

a follower residing within the casing, said follower further comprising a follower platform with one to four tines, one of the one to four tines being at a fore position that extends generally perpendicularly from the follower platform, the guide rails contacting the follower to act as a guide for the follower, a groove serving as a detent situated in the follower platform to interface with the stop tab.

2. The ammunition magazine of claim 1 , wherein the casing further comprises a constant internal curve initiating at the second open end and continuing through a majority of the casing of the magazine.

3. The ammunition magazine of claim 2 , wherein one of the one to four tines is arranged at an aft position of the follower platform that extends generally perpendicularly from the follower platform.

4. The ammunition magazine of claim 2 , wherein the casing further comprises a ridge, centrally located on an interior side of the fore side, wherein a front face of one of the one to four tines presses against the ridge.

5. The ammunition magazine of claim 1 , wherein the casing further comprises a ridge, centrally located on an interior side of the fore side, wherein a front face of one of the one to four tines presses against the ridge.

6. The ammunition magazine of claim 1 , wherein one of the one to four tines is arranged at an aft position of the follower platform that extends generally perpendicularly from the follower platform.

7. The ammunition magazine of claim 1 , wherein the casing further comprises a ridge, centrally located on an interior side of the fore side, wherein a front face of one of the one to four tines presses against the ridge.

8. The ammunition magazine of claim 1 , wherein one or more of the one to four tines is split into two regions via a vertical gap arranged at a center of the one or more tines.

9. An ammunition magazine comprising:

a casing with fore and aft sides and two longer lateral sides longer than the fore and aft sides and first and second open ends, the casing further comprising guide rails running along insides of the longer lateral sides, the casing further comprising a constant internal curve initiating at the second open end and continuing through a majority of the casing of the magazine, and the casing further comprising a stop tab projecting internally from a front of the casing; and

a follower residing within the casing, said follower further comprising a follower platform with one to four tines, one of the one to four tines being at a fore position that extends generally perpendicularly from the follower platform, the guide rails contacting the follower to act as a guide for the follower, a groove serving as a detent situated in the follower platform to interface with the stop tab, thereby preventing the follower from exiting the magazine through the first end.

10. The ammunition magazine of claim 9 , wherein the follower platform comprises a second tine at an aft position of the follower that extends generally perpendicularly therefrom.

11. The ammunition magazine of claim 10 , wherein the casing further comprises a ridge, centrally located on an interior side of the fore side, wherein a front face of one of the one to four tines presses against the ridge.

12. The ammunition magazine of claim 9 , wherein the casing further comprises a ridge, centrally located on an interior side of the fore side, wherein a front face of one of the one to four tines presses against the ridge.

13. The ammunition magazine of claim 9 , wherein one or more of the one to four tines is split into two regions via a vertical gap arranged at a center of the one or more tines.

14. An ammunition magazine comprising:

a casing with fore and aft sides and two longer lateral sides longer than the fore and aft sides and first and second open ends, the casing further comprising a ridge, on an interior side of the fore side, guide rails running along insides of the longer lateral sides; and

a follower residing within the casing, said follower further comprising a follower platform with one to four tines, one of the one to four tines being at a fore position that extends generally perpendicularly from the follower platform, the guide rails contacting the follower to act as a guide for the follower; and

a stop tab projecting internally from a front of the casing.

15. The ammunition magazine of claim 14 , further comprising a groove situated in the follower platform to interface with the stop tab.

16. The ammunition magazine of claim 14 , wherein the casing further comprises a constant internal curve initiating at the second open end.

17. The ammunition magazine of claim 16 , wherein one of the one to four tines is arranged at an aft position of the follower platform that extends generally perpendicularly from the follower platform.

18. The ammunition magazine of claim 16 , wherein the ridge is centrally located on an interior side of the fore side, wherein a front face of one of the one to four tines presses against the ridge.

19. The ammunition magazine of claim 14 , wherein one of the one to four tines is arranged at an aft position of the follower platform.

20. The ammunition magazine of claim 19 , wherein the ridge is centrally located on an interior side of the fore side, wherein a front face of one of the one to four tines presses against the ridge.

21. The ammunition magazine of claim 14 , wherein one or more of the one to four tines is split into two regions via a vertical gap arranged at a center of the one or more tines.

22. An ammunition magazine comprising:

a casing with fore and aft sides and two longer lateral sides longer than the fore and aft sides and first and second open ends, the casing further comprising guide rails running along insides of the longer lateral sides; and

a follower residing within the casing, said follower further comprising a follower platform with one to four tines, one of the one to four tines being at a fore position that extends generally perpendicularly from the follower platform, another of the one or more tines being at an aft position, the guide rails contacting the follower to act as a guide for the follower; and

a stop tab projecting internally from a front of the casing.

23. The ammunition magazine of claim 22 , further comprising a groove situated in the follower platform to interface with the stop tab.

24. The ammunition magazine of claim 22 , wherein the casing further comprises a constant internal curve.

25. The ammunition magazine of claim 22 , wherein a front face of one of the one to four tines presses against a ridge located on an interior side of the fore side.

26. The ammunition magazine of claim 22 , wherein one of the one to four tines presses against a ridge.

27. The ammunition magazine of claim 22 , wherein one or more of the one to four tines is split into two regions via a vertical gap arranged at a center of the one or more tines.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jun 14, 2022
From: FITZPATRICK, RICHARD M.; MAYBERRY, MICHAEL T.; NAKAYAMA, BRIAN L.; BURT, ERIC C.
To: MAGPUL INDUSTRIES CORP.
Reel/Frame 060189/0635 →
Continuity (8)
Continuation 14632804 · Feb 26, 2015
Continuation 14461229 · Aug 15, 2014
Continuation In Part 14098467 · Dec 5, 2013
Continuation 13307431 · Nov 30, 2011
Continuation 12354766 · Jan 15, 2009
Continuation In Part 11958274 · Dec 17, 2007
Provisional Application 60941646 · Jun 1, 2007
Reissue 15661620 · Jul 27, 2017
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