Battle Arms Development 6 Position Buffer Tube, Mil-Spec Tube, Fits AR Rifles, Black AR15RE-MIL-6C This Battle Arms Development 6 Position Carbine Buffer Tube is constructed from 7075-T6 aircraft-grade aluminum has a hard black anodized finish" will fit all standard AR15/M16/M4 lower receivers" and is made in the USA. Battle Arms Development" Inc. (B.A.D. Inc.) is a design" research" and development firm incorporated in 2009 with a focus on small arms design including firearm components" tools" gauges" accessories" and complete weapon systems.