Real Avid Master Armorer's Mat - The Master Armorer's Mat is the ultimate solution for your gun building project. This massive mat will protect your large gun parts while the added organization trays will hold every medium and small component, making sure you don't lose any parts in the process. This isn't just a mat, it's the future of gun building. Upper Receiver Assembly - Expanded Parts Lower Receiver Assembly - Expanded Parts Bolt Carrier Grou- Expanded Parts Barrel Assembly - Expanded Parts Non-Slip, Oil-Resistant Surface Punches Organizer Compartment Integrated Parts Tray Folding Parts Box Designed To Snap In Place On Top Of The Parts And Tool Storage Tray