# US 2018/0321003 A1 · Bolt carrier support system

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- Number: US 2018/0321003 A1
- Document ID: US20180321003A1
- Status: Published application
- Kind: A1
- Application number: 16/025,593
- Filed: 2018-07-02
- Published: 2018-11-08
- Earliest claimed: 2015-01-20
- Assignees: Patriot Ordnance Factory, Inc.
- Applicants: Patriot Ordnance Factory, Inc.
- Inventors: Frank L. DeSomma
- Web page: https://patentgrep.com/patent/US20180321003A1

## CPC

- F41A 3/82: Coil spring buffers (F41A3/80 takes precedence)
- F41A 3/66: Breech housings or frames; Receivers
- F41A 3/26: semi-automatically or automatically operated, e.g. having a slidable bolt-carrier and a rotatable bolt
- F41A: FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE

## Abstract

In various embodiments, a buffer retention system may comprise a body, a retention tab and a spring. The body may comprise a generally cylindrical portion and a partially annular guide portion. The generally cylindrical portion may define a channel. The partially annular guide portion may be operatively coupled to the cylindrical portion. The retention tab may be installable in the channel. The retention tab may be configured to protrude through the partially annular guide portion. The spring may be installable within the channel. The spring may be configured to position the retention tab through the partially annular guide portion.

## Claims

### Claim 1

A firearm comprising a buffer retention system located within a lower receiver of the firearm, the buffer retention system comprising:
a generally cylindrical portion defining a channel in an interior of the generally cylindrical portion;
a partially annular guide portion located forward of a lower portion of a buffer tube, wherein the partially annular guide portion is coaxial with the buffer tube, wherein a support surface of the partially annular guide portion is configured to engage and support a portion of a bolt carrier, wherein the generally cylindrical portion and the partially annular guide portion are removable from the lower receiver;
a retaining pin configured to translate within the channel, wherein the retaining pin is configured to retain a buffer within the buffer tube; and
a spring located within the channel and configured to position the retaining pin through an aperture of the partially annular guide portion.

### Claim 2 (depends on 1)

The buffer retention system of claim 1, wherein the firearm is an AR-15 style rifle.

### Claim 3 (depends on 1)

The buffer retention system of claim 1, wherein the buffer retention system is configured to engage and retain the buffer tube.

### Claim 4 (depends on 1)

The buffer retention system of claim 1, wherein the buffer retention system is configured to support and guide an aft portion of the bolt carrier.

### Claim 5 (depends on 1)

The buffer retention system of claim 1, wherein the partially annular guide portion is configured to remain stationary in response to the retaining pin compressing the spring.

### Claim 6 (depends on 1)

The buffer retention system of claim 1, wherein the partially annular guide portion is configured to remain flush with the buffer tube in response to the retaining pin compressing the spring.

### Claim 7 (depends on 1)

The buffer retention system of claim 1, wherein the generally cylindrical portion and the partially annular guide portion are a single integral piece.

### Claim 8

A firearm, comprising:
an upper receiver comprising:
an operating system; and
a bolt rotatably moveable between a first position and a second position in response to an input from the operating system;
a barrel configured to receive the bolt;
a buffer system comprising a buffer located within a buffer tube; and
a lower receiver operatively coupled to the buffer tube, the lower receiver comprising:
a buffer retention system comprising:
a channel portion removably installed within the lower receiver;
a guide portion located forward of a lower portion of the buffer tube, wherein a support surface of the guide portion is configured to engage and support a portion of a bolt carrier, wherein the support surface is flush with the buffer tube, wherein the support surface is perpendicular to the channel portion, wherein the channel portion is not coaxial with the buffer tube; and
a retaining pin configured to translate within the channel portion, wherein contact between the retaining pin and an interior of the channel portion is configured to keep the retaining pin within the channel portion.

### Claim 9 (depends on 8)

The firearm of claim 8, wherein the guide portion is configured to remain stationary in response to the retaining pin compressing a spring in the channel portion.

### Claim 10 (depends on 8)

The firearm of claim 8, wherein the guide portion is configured to remain flush with the buffer tube in response to the retaining pin compressing a spring in the channel portion.

### Claim 11 (depends on 8)

The firearm of claim 8, wherein the channel portion and the guide portion are a single integral piece.