Abstract: A method of modifying a firearm barrel comprising the steps of milling an existing barrel to create a sloped area with a larger diameter at a chamber end and a small action moving toward the muzzle end; placing an barrel nut on the barrel; placing a chamber bushing having a step with the step disposed at the chamber end; placing a brass pressing guide on the barrel and placing the barrel assemble with brass press guide and rear jacket tube in a press to press fit these components together; placing a gas block on the barrel adjacent to the rear jacket tube pressing the components tougher using the press; placing a front jacket tube on the barrel adjacent to the gas block and pressing the components tougher using the press; covering the threads of the barrel and placing a pour guide on the barrel; filling a void defined between the front jacket tube, rear jacket tube and barrel with a filler; placing a centering device on the barrel so that it is operatively associated with the front jacket tube to center the b

Abstract: An improved weapon system modification directed to short stroke piston assemblies comprising: a housing having an inlet port for receiving gas from a barrel, a piston chamber and a piston contained within the chamber that, when actuated by gas, moves rearward toward a chamber contacting a bolt carrier and cycling the action; a front seating ring for receiving a front sleeve; a rear seating ring for receiving a rear sleeve; a barrel extending through the front sleeve, housing and rear sleeve defining one or more voids between the front sleeve, housing and rear sleeve and the barrel; filler material deposited and/or disposed in the void(s) that when cured or hardened, results in a barrel assembly dissipating heat and improving accuracy; a receiver plate included in the housing for attaching the housing to a receiver; a receiver block included in the housing for attaching the housing to the receiver; and, a lower track that can be attached to the housing and a barrel locking collar.

Abstract: A method of modifying a firearm barrel comprising the steps of milling an existing barrel to create a sloped area with a larger diameter at a chamber end and a small action moving toward the muzzle end; placing an barrel nut on the barrel; placing a chamber bushing having a step with the step disposed at the chamber end; placing a brass pressing guide on the barrel and placing the barrel assemble with brass press guide and rear jacket tube in a press to press fit these components together; placing a gas block on the barrel adjacent to the rear jacket tube pressing the components tougher using the press; placing a front jacket tube on the barrel adjacent to the gas block and pressing the components tougher using the press; covering the threads of the barrel and placing a pour guide on the barrel; filling a void defined between the front jacket tube, rear jacket tube and barrel with a filler; placing a centering device on the barrel so that it is operatively associated with the front jacket tube to center the b