Ultimate Arms Gear Cutaway Color Design AR15/AR-15/M4/M16 Rifle Gunsmith/Armorer's Cleaning Work Tool Bench Gun Schematics Mat Large Cutaway 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 with Color Imprinted of AR-15 Exploded Cutaway View