Choate Tool Tc Survivor StockMulti Calibers. 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 our 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. Specifications for Choate Tool Tc Survivor Stock: Manufacturer: Choate Tool Gun Make: Thompson/Center Arms Country of Origin: USA Features of Choate Tool Tc Survivor Stock Integral storage compartment. Durable glass filled polymer construction Package Contents: Choate Tool Tc Survivor Stock Choate Tool CMT-09-01-12: Tc Survivor StockMulti Calibers