Breakthrough AR15 Modern Sporting Rifle Armorer's Wrench - Black - The Breakthrough Clean Technologies Armorer's Wrench is the ultimate tool for your AR15/M4. Constructed out of durable titanium-plated stainless steel and includes a standard size muzzle device wrench. Easily installs and removes receiver extensions and castle nuts, functioning with both Mil-Spec and Pin-Style Barrel Nuts. Compatible with 1/2in Socket / Torque wrench and comes with a bonus Butt Stock Screwdriver. UNIVERSAL WRENCH: The Breakthrough Clean Technologies universal wrench is the ultimate tool for every day use. Constructed of durable Titanium plated stainless steel EASY TO ADJUST: Includes standard size muzzle device wrench. Easily install & remove parts. Functions with both Mil-Spec & Pin-Style assembly. Compatible with Socket / Torque wrench.