Sep 15, 2026

US12736294 - Roller delayed firearm operating system

An operating system for a firearm includes a forward bolt includes a forward bolt cavity, a carrier disposed on a rear side of the forward bolt, the carrier including a carrier cavity, a short cam pin including (i) a forward section that is at least partially disposed within the forward bolt cavity and (ii) a rear section that is at least partially disposed within the carrier cavity, a plurality of bearings that interface with the forward bolt, a retracted configuration where the short cam pin is in a rear position relative to the forward bolt, and a deployed configuration where the short cam pin is in a forward position relative to the forward bolt.

Inventors: James Matthew Underwood, Larry Cullen Underwood
Filing date: 2024-10-16

firearmoperating_systemsemi_automatic

The patent describes a roller delayed operating system for a semi-automatic firearm, featuring a forward bolt with a cavity, a carrier, and a short cam pin that interacts with a plurality of bearings. This system allows for distinct configurations of the cam pin to optimize the movement of the bolt relative to the carrier.

Claim 1

1 . A firearm operating system configured for a semi-automatic firearm, the firearm operating system comprising: a bolt; a plurality of bearings disposed at least partially within the bolt; a carrier disposed on a rear side of the bolt; and a cam pin, wherein: the bolt is configured to move in a forward/aft direction relative to the carrier; and the cam pin comprises a plurality of surfaces that each correspond to one of the plurality of bearings. a bolt; a plurality of bearings disposed at least partially within the bolt; a carrier disposed on a rear side of the bolt; and a cam pin, wherein: the bolt is configured to move in a forward/aft direction relative to the carrier; and the cam pin comprises a plurality of surfaces that each correspond to one of the plurality of bearings.

Google Patents

https://patents.google.com/patent/US12736294

USPTO PDF

https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/12736294