Mar 24, 2026

US12584701 - Roller and bearing delayed firearm operating systems

A firearm operating system includes a forward bolt with an internal cavity, a carrier disposed on a rear side of the forward bolt where the carrier includes a cavity, a short cam pin, a plurality of bearings, a retracted configuration, and a deployed configuration. At least a portion of a forward section of the short cam pin is disposed within the internal cavity of the forward bolt. At least a portion of a rear section of the short cam pin is disposed within the cavity of the carrier. Movement from the retracted configuration to the deployed configuration includes movement in a forward/aft direction of the short cam pin relative to the forward bolt and movement of the plurality of bearings.

Inventors: James Matthew Underwood, Larry Cullen Underwood
Filing date: 2024-05-28

firearmoperating_systemmechanism

The patent describes a firearm operating system that utilizes a forward bolt with an internal cavity, a carrier with a rear cavity, and a cam pin that facilitates movement between retracted and deployed configurations using a plurality of bearings. This innovative design aims to enhance the efficiency and reliability of the firearm’s operation.

Claim 1

1 . A firearm operating system comprising: a bolt comprising a rear cavity; a plurality of bearings disposed at least partially within the bolt; a carrier disposed on a rear side of the bolt, the carrier comprising a forward cavity; a cam pin comprising a forward section; and a bolt extension at least partially attached to a rear of the bolt, a bolt comprising a rear cavity; a plurality of bearings disposed at least partially within the bolt; a carrier disposed on a rear side of the bolt, the carrier comprising a forward cavity; a cam pin comprising a forward section; and a bolt extension at least partially attached to a rear of the bolt, wherein: the forward section of the cam pin is disposed within the rear cavity of the bolt; and the forward section of the cam pin comprises a plurality of forward surfaces that each correspond to one of the plurality of bearings. the forward section of the cam pin is disposed within the rear cavity of the bolt; and the forward section of the cam pin comprises a plurality of forward surfaces that each correspond to one of the plurality of bearings.

Google Patents

https://patents.google.com/patent/US12584701

USPTO PDF

https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/12584701