The AR15-M4-M16 Combo Wrench Tool is a durable universal tool for both M16 fixed stock and M4 collapsing stock variants of the AR-15 platform. It allows the installation and removal of barrel nuts, muzzle devices, and buttstocks. 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.