Multi-function steel tool helps keep your rifle in the ready condition. Use it to tighten or remove the barrel nut, and install or remove most popular free-float handguard tubes. Single-point wrench tightens/removes the receiver extension nut, and side notches tighten or remove a variety of muzzle devices, including flash hiders and muzzle brakes. It even has a tab that acts as a screwdriver for the A1/A2 stock. Includes ½" drive opening.