Oct 20, 2026

US12768606 - Firearm piston and fire control mechanism

A firearm comprising of a chassis, a barrel, a slide, and a reciprocating block connected to the chassis. The reciprocating block is operable to reciprocate with respect to the barrel between a chamber open position in which a face portion of the block is spaced apart from the breech end of the barrel and a chamber closed position in which the face portion of the block is proximate the breech end of the barre. A locking element selectively engages the slide and the block and operable to prevent rearward movement of the block when the slide is in the battery position, and to enable rearward movement of the block when the slide has moved rearward with respect to the block by a limited distance to an intermediate position forward of the recoil position.

Inventors: Geoffrey Louis Ader
Filing date: 2025-04-29

firearmmechanismcontrolpiston

The patent describes a firearm design featuring a chassis, barrel, slide, and a reciprocating block that operates between open and closed chamber positions. A locking mechanism is included to control the movement of the block in relation to the slide, ensuring safe operation during firing and cycling.

Claim 1

1 . A firearm comprising: a chassis; a barrel connected to the chassis and having breech end defining a chamber; a slide operable to reciprocate with respect to the chassis between a forward battery position and a rearward recoil position; a reciprocating block connected to the chassis and operable to reciprocate with respect to the slide between a block rear position in which a first limit surface of the slide abuts the block, and a block forward position in which the block is spaced apart from the first limit surface of the slide, the reciprocating block operable to reciprocate with respect to the barrel between a chamber open position in which a face portion of the block is spaced apart from the breech end of the barrel and a chamber closed position in which the face portion of the block is proximate the breech end of the barrel; and a plurality of locking elements selectively engaging at least the slide and the block and operable to prevent rearward movement of the block when the slide is in the battery position, and to enable rearward movement of the block when the slide has moved rearward with respect to the block by a limited distance to an intermediate position forward of the recoil position. a chassis; a barrel connected to the chassis and having breech end defining a chamber; a slide operable to reciprocate with respect to the chassis between a forward battery position and a rearward recoil position; a reciprocating block connected to the chassis and operable to reciprocate with respect to the slide between a block rear position in which a first limit surface of the slide abuts the block, and a block forward position in which the block is spaced apart from the first limit surface of the slide, the reciprocating block operable to reciprocate with respect to the barrel between a chamber open position in which a face portion of the block is spaced apart from the breech end of the barrel and a chamber closed position in which the face portion of the block is proximate the breech end of the barrel; and a plurality of locking elements selectively engaging at least the slide and the block and operable to prevent rearward movement of the block when the slide is in the battery position, and to enable rearward movement of the block when the slide has moved rearward with respect to the block by a limited distance to an intermediate position forward of the recoil position.

Google Patents

https://patents.google.com/patent/US12768606

USPTO PDF

https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/12768606