Armorer's Wrench – AR15/M4The Magpul Armorer's Wrench AR15 M4 is an American made, extremely durable, solid steel tool that's comfortable to grip. Engages both stock and pin style barrel nuts. Fits standard sized flash hiders. Installs and removes rifle receiver extensions and carbine castle nuts, and has extended teeth for use with ASAP plates. Includes two hammer faces. The Magpul Armorer's Wrench works with a 1 2" torque wrench, and relevant torque specifications are