Magazine structure and insert

Patent metadata

Field	Value
Publication number	US-10809028-B2
Application number	US-201916397546-A
Country	US
Kind code	B2
Filing date	Apr 29, 2019
Priority date	Apr 27, 2018
Publication date	Oct 20, 2020
Grant date	Oct 20, 2020

Abstract

A firearm assembly includes an insert including a front strap, a leading member, a dowel member located at a lower end of the leading member, and a floorplate flexibly coupled to a lower end of the front strap, wherein the front strap and leading member extend between an upper end of the insert and a lower end of the insert; a follower configured to move vertically in relation to the insert; a rear strap removably attachable to the floorplate; and a spring disposed above the floorplate, wherein the front strap and rear strap are internally disposed in the spring and the follower is removably attached to an upper end of the spring.

First claim

That which is claimed is:

1. A magazine assembly for a firearm comprising:
a floorplate;
an insert comprising an uppermost surface and a channel that extends across the uppermost surface such that the channel acts as a feed ramp;
a follower disposed adjacent to the insert, wherein the follower moves relative to the floorplate and the insert; and
a spring disposed between the floorplate and the follower.

2. The magazine assembly of claim 1 , wherein the insert comprises at least one attachment to the floorplate.

3. The magazine assembly of claim 2 , wherein the at least one attachment to the floorplate is a permanent attachment.

4. The magazine assembly of claim 2 , wherein the at least one attachment to the floorplate comprises at least one permanent attachment and at least one replaceable attachment.

5. The magazine assembly of claim 1 , wherein the channel comprises a contoured portion of the uppermost surface that guides cartridges when the cartridges exit the magazine assembly.

6. The magazine assembly of claim 1 , wherein a length of the follower combined with a length of the insert approximately correspond to an internal length of a main body for the magazine assembly.

7. The magazine assembly of claim 1 , wherein the insert comprises an ejector located at an upper end of the insert.

8. The magazine assembly of claim 1 , wherein:
the magazine assembly is designed to interface with a main body for a rifle caliber magazine; and
the follower is designed for a handgun caliber and the insert is sized to reduce an internal length of the main body to be appropriate for the handgun caliber.

9. The magazine assembly of claim 1 , further comprising a main body for containing components of the magazine assembly, wherein the insert is a separate component from the main body.

10. The magazine assembly of claim 1 , further comprising a main body for containing components of the magazine assembly, wherein the insert is an integral component of the main body.

11. A method of retrofitting a conventional magazine with a magazine assembly, the method comprising:
removing a magazine spring from inside of a main body of the conventional magazine;
removing an old follower from inside of the main body of the conventional magazine;
inserting a new follower into the main body;
inserting an insert into the main body, wherein the insert comprises a front strap and a floorplate attached to the front strap; and
pivoting the floorplate relative to the front strap of the insert such that the floorplate is approximately parallel with the front strap.

12. The method of claim 11 , wherein the conventional magazine is designed for a rifle caliber and the new follower is designed for a handgun caliber.

13. The method of claim 11 , wherein inserting the insert into the main body comprises reducing an internal length of the main body.

14. The method of claim 11 , wherein the new follower extends between a rear side of the insert and an internal surface of the main body.

15. The method of claim 11 , further comprising:
sliding a spring over the floorplate so the front strap is internal to the spring;
releasing the floorplate;
flexing a leading member of the insert towards the front strap;
attaching an engaging member of the leading member to the floorplate;
attaching the new follower to an upper portion of the spring;
inserting a rear strap through an opening in the new follower and through the spring;
attaching the rear strap to the floorplate; and
inserting the new follower, the spring, the insert, and the rear strap into the main body of the conventional magazine.

16. A firearm assembly comprising:
an insert comprising a front strap, a leading member, an engaging member located at a lower end of the leading member, and a floorplate flexibly coupled to a lower end of the front strap, wherein the front strap and leading member extend between an upper end of the insert and a lower end of the insert;
a follower configured to move vertically in relation to the insert; and
a rear strap removably attachable to the floorplate.

17. The firearm assembly of claim 16 , wherein the insert further comprises a feed ramp channel at the upper end of the insert.

18. The firearm assembly of claim 17 , wherein the feed ramp channel comprises a compound curve.

19. The firearm assembly of claim 16 , wherein the insert comprises an ejector at the upper end.

20. The firearm assembly of claim 16 , further comprising an ejector attached to an upper receiver.

21. The firearm assembly of claim 16 , wherein the follower comprises a spine disposed at a trailing edge of the follower, wherein the spine comprises at least one notch.

22. The firearm assembly of claim 21 , wherein a lower end of the spine contacts the floorplate when the follower is moved toward the lower end of the insert to define a maximum capacity for a magazine of the firearm assembly.

23. The firearm assembly of claim 22 , wherein the spine is configured to be modified by removing material below the at least one notch to alter the lower end of the spine such that the maximum capacity for the magazine changes.

24. The firearm assembly of claim 16 , further comprising a spring disposed above the floorplate, wherein the front strap and rear strap are internally disposed in the spring and the follower is removably attached to an upper end of the spring.

Assignees

• Underwood James Matthew
• Underwood Larry Cullen

Inventors

• Underwood James Matthew
• Underwood Larry Cullen

Classifications

• F41A9/71 Primary

  Arrangements thereon for varying capacity; Adapters or inserts for changing cartridge size or type · CPC title

• F41A9/70

  Arrangements thereon for discharging, e.g. cartridge followers or discharge throats · CPC title

• F41A9/65 Primary

  Box magazines having a cartridge follower · CPC title