The T/C Contender Survivor stock gives you a place to carry ammo and supplies in the butt stock. The storage compartments are opened by removing the thumb screw on the back of the stock and hinging the butt plate down, this allows access to the two 7 1/2 INCH DEEP BY 2 INCH TALL BY 1 INCH WIDE COMPARTMENTS. This stock is Choate’s answer for the Contender fans that keep their carbine with them all the time. You can not use this stock with a barrel shorter than 16 inches. BATF regulations apply.