to be employed with any indirect gas operated firearm it will also be understood that bolt carrier 10 is carried by an upper receiver 12 that cooperates with a lower receiver 11 and receiver extension 41 of a gas operated automatic or semi automatic firearm generally designated by reference numeral 13 as shown in fig3 a and 3b as is known the firearm 13 includes a gas operating system generally designated by reference numeral 42 and a barrel 43 the receiver extension is received within the buttstock 49 in fig1 and 2 the preferred embodiment of the bolt carrier 10 is shown the bolt carrier 10 includes a hammer clearance slot 14 which permits the hammer not shown but well known in the art to extend into the bolt carrier 10 and strike a firing pin not shown positioned in bore 16 the exterior of the carrier includes a door opener 18 which provides room for the door latch well known in the art to close and a cam slot 20 which provides a contained area for the cam pin not shown to rotate thus allowing the bolt 22 see fig6 to move rearwardly and rotate axially in the bolt carrier 10 the cam pin retains the bolt 22 within the bolt carrier 10 as is known.