GunClaims
Weekly firearms and ammunition patent grants.
Dec 30, 2025

US12510316 - Box magazine fed firearm receiver with pinch tabs

A box magazine fed firearm includes pinch tabs in the receiver of the firearm. In one embodiment, the pinch tabs are opposing pieces of spring steel extending upwardly and inwardly from opposing lateral sides of the receiver. In one embodiment, the pinch tabs are sections of flat spring steel bent into an arcuate shape and secured to the receiver by screws. In one embodiment, tension screws are used to adjust an inward bias of each of the pinch tabs.

firearmreceivermagazineammunition

The patent describes a firearm receiver designed to accommodate a box magazine, featuring pinch tabs that help retain the ammunition round in alignment with the chamber. These pinch tabs, made from spring steel, provide downward force on the round as the bolt moves forward, ensuring proper feeding from the magazine.

Claim 1

1 . A firearm comprising: a receiver configured to receive a box magazine containing a round of ammunition, receive the round from the box magazine, and provide the round to a chamber of the firearm, wherein the chamber extends along a longitudinal axis of the firearm; and a pair of pinch tabs extending laterally inward from opposing sides of the receiver, said pinch tabs configured to contact the round and cooperate with rear feed lips of the box magazine to retain the round generally parallel to the longitudinal axis when a bolt of the firearm is in a rear position of the bolt and the box magazine is in the receiver with the round in the box magazine, wherein: as the bolt moves from the rear position of the bolt to a forward position of the bolt, the bolt pushes a rear end of the round forward of the rear feed lips of the box magazine such that only the pair of pinch tabs are exerting downward force on the round. a receiver configured to receive a box magazine containing a round of ammunition, receive the round from the box magazine, and provide the round to a chamber of the firearm, wherein the chamber extends along a longitudinal axis of the firearm; and a pair of pinch tabs extending laterally inward from opposing sides of the receiver, said pinch tabs configured to contact the round and cooperate with rear feed lips of the box magazine to retain the round generally parallel to the longitudinal axis when a bolt of the firearm is in a rear position of the bolt and the box magazine is in the receiver with the round in the box magazine, wherein: as the bolt moves from the rear position of the bolt to a forward position of the bolt, the bolt pushes a rear end of the round forward of the rear feed lips of the box magazine such that only the pair of pinch tabs are exerting downward force on the round.

Google Patents

https://patents.google.com/patent/US12510316

USPTO PDF

https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/12510316