Oct 27, 2026

US12774862 - Semiautomatic firearm

A reciprocating bolt assembly has delayed blowback and a firing pin block. Features prevent out-of-battery firing, when the bolt assembly is not fully engaged to the firing chamber or barrel face, a movable member within a bolt body functions as a blocking member that blocks the firing pin and prevents the firing pin from striking a cartridge. In embodiments, the firing pin has two stop portions that the movable member can engage depending on the cycle status of the firearm. A reverse cam mechanism associated with the firing pin blocking provides a resistance to and delays blowback.

Assignee: Savage Arms, Inc.
Inventors: Ivan Kolev, John Linscott
Filing date: 2024-10-30

semiautomaticfirearmmechanismblowback

The patent describes a semiautomatic firearm featuring a delayed blowback mechanism that includes a reciprocating bolt assembly and a firing pin block to prevent out-of-battery firing. The design incorporates a movable member within the bolt assembly that engages with a transition surface to delay the bolt’s rearward movement during firing, enhancing safety and reliability.

Claim 1

1 . A firearm with a delayed blowback mechanism, comprising: a receiver having a recess defining a transition surface; a bolt assembly slidably engaged within the receiver and movable between an in-battery position and an out-of-battery position; and a movable member within the bolt assembly, the movable member having a first position when the bolt assembly is in the in-battery position and a second position when the bolt assembly is in the out-of-battery position, wherein the movable member comprises a cam surface configured to be received in the recess when the movable member is in the first position, wherein the movable member is biased toward the first position to provide a frictional engagement between the cam surface and the transition surface, and wherein a firing pin is configured to cooperate with and extend through the movable member; wherein, upon firing, the frictional engagement of the cam surface with the transition surface causes the movable member to resist movement from the first position to the second position, wherein the transition surface alone acts to cam the movable member inwardly against the bias to delay rearward movement of the bolt assembly. a receiver having a recess defining a transition surface; a bolt assembly slidably engaged within the receiver and movable between an in-battery position and an out-of-battery position; and a movable member within the bolt assembly, the movable member having a first position when the bolt assembly is in the in-battery position and a second position when the bolt assembly is in the out-of-battery position, wherein the movable member comprises a cam surface configured to be received in the recess when the movable member is in the first position, wherein the movable member is biased toward the first position to provide a frictional engagement between the cam surface and the transition surface, and wherein a firing pin is configured to cooperate with and extend through the movable member; wherein, upon firing, the frictional engagement of the cam surface with the transition surface causes the movable member to resist movement from the first position to the second position, wherein the transition surface alone acts to cam the movable member inwardly against the bias to delay rearward movement of the bolt assembly.

Google Patents

https://patents.google.com/patent/US12774862

USPTO PDF

https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/12774862