Patent ID: 7997020
Filing Date: 2011-08-16
Classification: F41A

Abstract:
1. A firearm comprising: a receiver housing an action-cycling mechanism; a barrel having a muzzle opening on a distal end; a shroud coaxially surrounding at least a portion of the barrel, the shroud having: a front wall disposed at the distal end portion of the shroud, the front wall having an opening to allow passage of a projectile fired from the gun barrel; a firewall disposed in the annular region of the proximal portion of the shroud, the firewall moveable relative to the gun barrel between a forward, at-rest position, and a rearward, compressed position, the firewall mechanically engaged with the action cycling mechanism; heat-dissipating fins in the annular region extending longitudinally along, and radially outward from, the gun barrel to the shroud, the fins defining channels; the firewall disposed in at least one of the channels; whereby gases generated during a firing of the firearm compress the firewall rearward to operate the cycling mechanism.