Recoil spring for a firearm

Patent metadata

Field	Value
Publication number	US-10077958-B2
Application number	US-201815864563-A
Country	US
Kind code	B2
Filing date	Jan 8, 2018
Priority date	Mar 18, 2016
Publication date	Sep 18, 2018
Grant date	Sep 18, 2018

Abstract

A firearm includes a receiver for housing a trigger mechanism. The receiver is attached to a firearm barrel, and the receiver includes a bolt carrier that is configured to reciprocate therein. The firearm includes a recoil spring that has a first end and a second end, and the first end interfaces with the bolt carrier. The recoil spring further includes a dampened portion positioned between the first and second ends. The dampened portion has a plurality of dead spring coils. The firearm also includes a spring retainer that is configured to retain the recoil spring within the firearm.

First claim

What is claimed is:

1. A recoil spring for a firearm, the recoil spring comprising:
a first end and a second end, wherein the first end is configured to interface with a bolt carrier of a firearm; and
a dampened portion positioned between the first and second ends, the dampened portion having a plurality of inactive spring coils, wherein the dampened portion is abutted on each side by a plurality of active coils, and
wherein the recoil spring is constructed to stop the bolt carrier from moving toward the rear of the firearm after a round of ammunition has been fired from the firearm, and to force the bolt carrier toward the front of the firearm until the bolt carrier reaches a ready-to-fire position.

2. The recoil spring of claim 1 including between about two and about four inactive coils.

3. The recoil spring of claim 1 , wherein the dampened portion is positioned about halfway between the first and second ends of the recoil spring.

4. The recoil spring of claim 1 , wherein the recoil spring is manufactured from chrome silicon steel.

5. The recoil spring of claim 1 , wherein the recoil spring has a free length of between about 17 inches and about 17.125 inches.

6. The recoil spring of claim 1 , wherein the dampened portion increases the lifetime and reliability of the firearm.

7. A method of installing a recoil spring into a firearm, the firearm having a bolt carrier configured to slide within a receiver during a firing cycle, the method comprising:
mounting the recoil spring to a retaining device; and
mounting the retaining device to the receiver of the firearm;
wherein the recoil spring has a first end and a second end, a dampened portion positioned between the first and second ends, the dampened portion having a plurality of inactive spring coils and being abutted on each side by a plurality of active coils.

8. The method of claim 7 , wherein the recoil spring is constructed to stop the bolt carrier from moving toward the rear of the firearm after a round of ammunition has been fired from the firearm, and to force the bolt carrier toward the front of the firearm until the bolt carrier reaches a ready-to-fire position.

9. The method of claim 7 , wherein the retaining device is a spring guide, and the method further comprises:
installing the recoil spring around a rod of the spring guide; and
mounting the spring guide to the receiver of the firearm.

10. The method of claim 9 , wherein the step of installing the recoil spring around the rod of the spring guide includes retaining the recoil spring around the rod with a fastener.

11. The method of claim 9 , further comprising interfacing the second end of the recoil spring with a base of the spring guide.

12. The method of claim 11 , wherein the step of mounting the spring guide to the receiver includes securing the base of the spring guide to the receiver of the firearm.

13. The method of claim 7 , wherein the retaining device is a buffer tube, and the method further comprises:
installing the recoil spring in the buffer tube; and
mounting the buffer tube to the receiver of the firearm.

14. A firearm comprising the recoil spring of claim 1 .

Assignees

• Whg Properties Llc

Inventors

• Geissele William H

Classifications

• F41A3/86 Primary

  mounted under {or above} the barrel · CPC title

• F41A3/54

  Bolt locks of the unlocked type, i.e. being inertia operated · CPC title

• F41A3/66

  Breech housings or frames; Receivers · CPC title

• F41A3/82 Primary

  Coil spring buffers (F41A3/80 takes precedence) · CPC title