Patent ID: 7832326
Filing Date: 2010-11-16
Classification: F41A

Abstract:
1. A firearm comprising; a body; a bolt assembly reciprocating within the body; a barrel defining a bore and extending from the body; a gas block defining an elongated chamber and connected to the barrel; the gas block and barrel defining a gas passage communicating between the barrel bore and the gas block chamber; an operating rod having a piston at a forward end portion closely received in the gas block chamber and a rear end positioned to operably engage the bolt assembly; the piston having a front end and a rear end; the gas block chamber having a forward portion closely receiving the forward end portion of the rod; the gas block chamber having a rearward portion with a profile along its length that is wider than the forward portion; the forward and rearward portions of the chamber being separated at a limit line; wherein the piston moves in a forward direction from a larger portion of the chamber to a position within a narrower portion of the chamber; wherein when the piston is in the forward most position, the rear end of the piston is approximately aligned with the limit line; and wherein when the piston is in the rearward most position, the front end of the piston is aligned with or slightly forward of the limit line.