Multi-function AR-15 armorer's wrench — the tool that pulls together castle-nut, barrel-nut, and muzzle-device work into one handle. Built for AR-15 / M4 builds; skip the three separate wrenches.

Features:

• Castle-nut spanner with staking pin for receiver-extension torque
• Barrel-nut wrenching surface — mates with standard mil-spec and free-float barrel nuts
• A2 flash-hider and standard muzzle-device flats
• Standard 1/2" drive receptacle for torque-wrench work
• Steel construction, matte finish

Use: pair with a torque wrench for castle-nut (40 ft-lbs) and muzzle-device (18-28 ft-lbs) work. Free-float barrel-nut torque varies by handguard maker — check the handguard install spec first. Handles most standard AR-15 builds; proprietary barrel nuts (Aero ATLAS, some Geissele handguards) still need the handguard maker's wrench.

Not intended for use on AR-10 / .308 platforms — those parts use larger flats.