TacFire AR10 BUFFER TUBE KIT/REG END PLATE BLACK. 308 in Condition: New Package Contents: TacFire Ar10 Buffer Tube Kit/Reg End Plate Mil-Spec 6 Position Buffer Tube 3.8 oz. Buffer .308 Buffer Spring Standard End Plate Castle Nut What firearm models does the manufacturer say TacFire Ar10 Buffer Tube Kit/Reg End Plate is compatible with? The manufacturer says that TacFire Ar10 Buffer Tube Kit/Reg End Plate is compatible with AR-10TacFire MAR047-308-A: AR10 BUFFER TUBE KIT/REG END PLATE BLACK