Our Brass Catchers are uniquely designed to conform to the shape of the firearm. Snaps on and off instantly and are made from strong, light weight, black textured plastic. Each holds a minimum of 60 rounds except (Item #123 - Colt .45, 1911 Frame holds 20 rounds, Item #131 holds 100 links and rounds, Item #138 - M3/M3A1 Grease Gun holds 25 rounds and Item #135, 136 & 137 Shotgun Catchers hold a maximum of 5 rounds). Our Brass Catchers will not interfere with any moving parts on the firearm. RIGID BRASS CATCHERS are a pleasant way to save time, money and will also increase the safety factor for the left-handed shooter.