Knight's Armament Barrel Extension Action Wrench

The Knight’s Armament Barrel Extension Action Wrench is a purpose-built armorer tool designed to hold an SR-15 or SR-25 upper receiver securely in a bench vise during firearm maintenance. The wrench inserts through the rear of the upper receiver and interfaces directly with the barrel extension, allowing controlled support while work is performed on components such as muzzle devices or rail systems.

This tool is engineered specifically for Knight’s Armament SR-15 E3 and SR-25 barrel extensions and is not intended for use with standard AR-15 square-lug barrel extensions. Use with incompatible barrel extensions may result in damage to the tool.