Ultimate Arms Gear AR15 AR-15 AR 15 M4 M16 Rifle Gunsmith/Armorer's Cleaning Work Tool Bench Gun Mat Large exploded view schematics diagram of gun 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 Diagram and Parts Description. Black Mat Imprinted with AR-15 Exploded View