Patent ID: 7717024

Claim:
A recoil operated firearm comprising: a barrel having a longitudinal bore axis; a bolt being collinear with the bore axis; a chamber comprising a ammunition-holding cavity formed therethrough, the ammunition-holding cavity having a longitudinal axis collinear with the bore axis; the chamber being adapted for linear movement between a charged position and a firing position, wherein the linear chamber movement is relative to the barrel and collinear with the bore axis, wherein, when in the chamber charged position: the chamber is positioned rearward end of the barrel, the forward end of the chamber is spaced a distance away from the rearward of the end of the barrel, and the chamber overrides at least a portion of the bolt such that the bolt occupies at least a portion of the ammunition-holding cavity; and wherein, when in the chamber firing position: a forward surface of the chamber sealingly contacts a rearward surface of the barrel, and a forward end of the bolt sealingly contacts a rearward end of the chamber.