This AR-15 / M16 Multi-Tool is a must for any AR-15 ,M4, M16 owner (New Style Armorer's Wrench) that fits the latest model CAR stock with the 3 point castle nut - 3 point locking ring. This tool does it all in one tool. Install and disassemble Free Float Tubes and peg-style barrel nuts, Install and disassemble Barrel nut, Install and disassemble Compensator Install and disassemble Barrel Extension Tube, Install and disassemble Carbine Stock ,1/2" drive for socket wrench. A two sided wrench at one end fits either multi-point or peg style barrel nuts on barrels up to 1" in diameter. This heavy duty tool combines many necessary functions for the AR15/M16 armorer, and features rugged steel construction Made from solid 4140 Steel powder coated with a hammered grey finish. Lifetime limited warranty.