The AR15 Stock Combo Wrench Tool is a durable, all-in-one tool for removing and installing barrel nuts, muzzle devices, and the castle nut on M4 buffer tubes. It has a heavy-duty construction of 4140 powder-coated steel and can be used with CAR stocks with a 3-point castle nut/locking ring. Use this tool to install and disassemble nuts, compensators and tubes. It makes removing or installing an AR-15 barrel a breeze. The tool is 12 1/2” in overall length.