Granted Patent B2

US 12,729,923 · App. 19/482,095 · Granted Sep 8, 2026

Inventors: Peter Zagone (Commerce City, CO); Libardo Jimenez (Arvada, CO); Nicholas Kielsmeier (Denver, CO)

Assignee: Magpul Industries Corp.

F41A9/70C08L81/06F41A9/65C08L2205/025C08L2205/03

Abstract

Claims (32)

1 . A magazine for a firearm, the magazine comprising:

a casing, the casing being fabricated from a mixture of Polyetherimide (PEI) and at least one of the following: Polyphenylsulfone (PPSU), Polyethersulfone (PES) and Polysulfone (PSU);

a follower residing within the casing;

a floor plate configured to interface with the casing; and

a follower spring coupled between the follower and the floor plate.

2 . The magazine of claim 1 , wherein the mixture comprises at least PPSU and PEI.

3 . The magazine of claim 2 , wherein the mixture comprises about 40-80% PPSU and about 20-60% PEI.

4 . The magazine of claim 2 , wherein the mixture comprises about 60-80% PPSU and about 20-40% PEI.

5 . The magazine of claim 2 , wherein the mixture comprises about 20-60% PEI and one of PES and PSU.

6 . The magazine of claim 2 , wherein the mixture further comprises one of PES or PSU.

7 . The magazine of claim 2 , wherein the casing comprises at least 10% PEI.

8 . The magazine of claim 7 , wherein the casing comprises at least 15% PEI.

9 . The magazine of claim 1 , wherein the mixture comprises PEI and one of PES and PSU.

10 . The magazine of claim 1 , wherein the magazine is a box magazine.

11 . A magazine for a firearm, the magazine comprising:

a casing, the casing being fabricated from a mixture of 20-60% Polyetherimide (PEI) and at least one of the following: Polyphenylsulfone (PPSU), Polyethersulfone (PES) and Polysulfone (PSU);

a follower residing within the casing;

a floor plate configured to interface with the casing; and

a follower spring coupled between the follower and the floor plate.

12 . The magazine of claim 11 , wherein the mixture comprises PEI and PPSU.

13 . The magazine of claim 12 , wherein the mixture comprises at least 40% PPSU.

14 . The magazine of claim 11 , wherein the mixture comprises at least 40% PEI.

15 . The magazine of claim 11 , wherein the follower is more opaque than the casing.

16 . A magazine for a firearm, the magazine comprising:

a casing, the casing being fabricated from a mixture of Polyetherimide (PEI) and at least one of the following: Polyphenylsulfone (PPSU), Polyethersulfone (PES) and Polysulfone (PSU);

an opaque follower residing within the casing;

a floor plate configured to interface with the casing; and

a follower spring coupled between the opaque follower and the floor plate.

17 . The magazine of claim 16 , wherein the casing comprises PEI and PPSU.

18 . The magazine of claim 16 , wherein the casing comprises PEI and at least two of: PPSU, PES and PSU.

19 . The magazine of claim 16 , wherein a percentage of PEI is greater than 20% and a percentage of PPSU is greater than 40%.

20 . The magazine of claim 16 , wherein a percentage of PEI is between 20% and 40%.

Assignments (1)

Continuity (2)

References Cited (60)