IP Library › Granted Patent US 12,644,661
Granted Patent B2
US 12,644,661 · App. 19/038,918 · Granted Jun 2, 2026

Firearm operating system

Inventors: James Matthew Underwood (Kennesaw, GA); Larry Cullen Underwood (Canton, GA)
F41A19/10F41A19/30F41C3/00
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Quick Facts
Patent No.
US 12,644,661
App. No.
19/038,918
Granted
Jun 2, 2026
Kind
B2
Abstract

A firearm operating system includes a housing, a central pivoting member disposed within the housing, a trigger including a portion disposed within the housing and a portion extending outside the housing such that the portion of the trigger within the housing includes a hole and at least one finger that extends in a first direction from the hole. Due to movement of the trigger, the at least one finger presses against the central pivoting member to cause the central pivoting member to rotate.

Claims (29)

1 . A semiautomatic handgun comprising:

a frame;

a trigger assembly attached to the frame; and

a slide assembly connected to the frame, wherein:

the trigger assembly comprises a curved portion, at least one protrusion extending from the trigger assembly, and a pivot pin;

a rearward pressure on the curved portion causes the trigger assembly to rotate in a first direction causing the semiautomatic handgun to discharge; and

a forward pressure causes the trigger assembly to rotate in a second direction that is opposite from the first direction, wherein rotation in the second direction disengages the slide assembly from the frame assembly.

2 . The semiautomatic handgun of claim 1 , wherein the pivot pin is disposed above the curved portion of the trigger.

3 . The semiautomatic handgun of claim 1 , wherein the at least one protrusion extends rearward from the trigger assembly.

4 . The semiautomatic handgun of claim 1 , further comprising a magazine well disposed in a grip portion of the frame.

5 . The semiautomatic handgun of claim 1 , wherein at least a portion of the frame comprises a polymer material.

6 . The semiautomatic handgun of claim 1 , further comprising at least one recoil spring.

7 . The semiautomatic handgun of claim 6 , wherein the at least one recoil spring is disposed in the frame at least partially under a barrel.

8 . The semiautomatic handgun of claim 1 , further comprising a barrel disposed in the slide assembly, wherein the barrel comprises at least one protrusion extending downward from the barrel.

9 . The semiautomatic handgun of claim 8 , further comprising a lock block comprising at least one corresponding feature that engages the at least one protrusion of the barrel.

10 . The semiautomatic handgun of claim 1 , wherein the frame comprises an accessory rail disposed on a forward side of a trigger guard.

11 . A semiautomatic handgun comprising:

a frame;

a trigger assembly attached to the frame; and

a slide assembly connected to the frame, wherein a forward pressure on the trigger assembly disengages the slide assembly from the frame assembly.

12 . The semiautomatic handgun of claim 11 , wherein the trigger assembly comprises a pivot pin that is disposed above the curved portion of the trigger.

13 . The semiautomatic handgun of claim 11 , wherein the trigger assembly comprises at least one protrusion that extends rearward from the trigger assembly.

14 . The semiautomatic handgun of claim 11 , further comprising a magazine well disposed in a grip portion of the frame.

15 . The semiautomatic handgun of claim 11 , wherein at least a portion of the frame comprises a polymer material.

16 . The semiautomatic handgun of claim 11 , further comprising at least one recoil spring.

17 . The semiautomatic handgun of claim 16 , wherein the at least one recoil spring is disposed in the frame at least partially under a barrel.

18 . The semiautomatic handgun of claim 11 , further comprising a barrel disposed in the slide assembly, wherein the barrel comprises at least one protrusion extending downward from the barrel.

19 . The semiautomatic handgun of claim 18 , further comprising a lock block comprising at least one corresponding feature that engages the at least one protrusion of the barrel.

20 . The semiautomatic handgun of claim 11 , wherein the frame comprises an accessory rail disposed on a forward side of a trigger guard.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jun 9, 2026
From: UNDERWOOD, JAMES MATTHEW; UNDERWOOD, LARRY CULLEN
To: MEAN LLC
Reel/Frame 075728/0686 →
Continuity (6)
Continuation 18206131 · Jun 6, 2023
Continuation 17862834 · Jul 12, 2022
Continuation 16920258 · Jul 2, 2020
Continuation 15365523 · Nov 30, 2016
Provisional Application 62261566 · Dec 1, 2015
Related Publication 20250189250A1 · Jun 12, 2025
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