Guntec USA .223 5.56 AR15 AR-15 M4 M16 Tan Gunsmith Cleaning Work Tool Bench Gun Mat with Large Exploded View Schematics Diagram of Carbine Rifle 15" x 36" Large Exploded View Schematics Diagram of Rifle and Parts List : 15" x 36". Neoprene Rubber Backing Prevents Fluids from Penetrating Through to Work Surface. Soft Polyester Top Protects Gun and Parts From Scratches.