Ultimate Arms Gear Black Gunsmith/Armorer's Cleaning Work Tool Bench Gun Mat AR15 AR-15 AR 15 M4 M16 Rifle + .223 556 5.56 MM Machine Gun Technical Manual Book US Army Military Large exploded view schematics diagram of rifle and parts list : 12" x 36" Neoprene rubber backing prevents fluids from penetrating through to work surface Soft polyester top protects gun and parts from scratches. Must Have Manual for Any Rilfe Owner Showing Detailed Information. Contains an Exploded View of All Parts for a Perfect in Depth Diagram. Also Goes into the History as well as Safety Guidelines.