US12352517 - Detent delayed blowback system and methods

The patent describes a delayed blowback system for firearms that utilizes a bolt with two detent members and a recoil spring guide rod featuring matching recesses. This design allows the bolt to slide between firing and recoil positions, enabling efficient cycling during operation by manipulating the detent members’ movement in response to the force generated when a round is fired.

Claim 1

1. A delayed blowback system for a firearm, the system comprising: a bolt with a bolt face and two detent members operatively coupled within the bolt, each detent member comprising a detent; and a recoil spring guide rod comprising two matching recesses on opposing sides of the recoil spring guide rod, wherein the bolt and the two detent members are coupled to and slidable along the recoil spring guide rod between a firing position and a recoil position, wherein: the firing position comprises the detents of the detent members resting in the matching recesses on the recoil spring guide rod and in position for firing a round; movement from the firing position to the recoil position comprises, in response to the round being fired, a cartridge case of the round applies an initial force on the bolt face of the bolt in a direction opposite a barrel of the firearm, and wherein a geometry of the detents of the detent members and a geometry of the matched recesses in the recoil spring guide rod operate to force the detent members in opposite directions and perpendicular to the direction of the initial force; and moving the bolt along the recoil guide rod in the direction of the initial force to perform a recoil cycle and moving the bolt back to the firing position. a bolt with a bolt face and two detent members operatively coupled within the bolt, each detent member comprising a detent; and a recoil spring guide rod comprising two matching recesses on opposing sides of the recoil spring guide rod, wherein the bolt and the two detent members are coupled to and slidable along the recoil spring guide rod between a firing position and a recoil position, wherein: the firing position comprises the detents of the detent members resting in the matching recesses on the recoil spring guide rod and in position for firing a round; movement from the firing position to the recoil position comprises, in response to the round being fired, a cartridge case of the round applies an initial force on the bolt face of the bolt in a direction opposite a barrel of the firearm, and wherein a geometry of the detents of the detent members and a geometry of the matched recesses in the recoil spring guide rod operate to force the detent members in opposite directions and perpendicular to the direction of the initial force; and moving the bolt along the recoil guide rod in the direction of the initial force to perform a recoil cycle and moving the bolt back to the firing position. the firing position comprises the detents of the detent members resting in the matching recesses on the recoil spring guide rod and in position for firing a round; movement from the firing position to the recoil position comprises, in response to the round being fired, a cartridge case of the round applies an initial force on the bolt face of the bolt in a direction opposite a barrel of the firearm, and wherein a geometry of the detents of the detent members and a geometry of the matched recesses in the recoil spring guide rod operate to force the detent members in opposite directions and perpendicular to the direction of the initial force; and moving the bolt along the recoil guide rod in the direction of the initial force to perform a recoil cycle and moving the bolt back to the firing position.

Google Patents

https://patents.google.com/patent/US12352517

USPTO PDF

https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/12352517