The LRI Action Wrench for RugerA(R) RPR / AR-15 is designed to aid you in fast, reliable, safe removal/installation of an AR-pattern rifle's barrel nut. This wrench will eliminate the headaches of sheared-off pins, damaged barrel nuts, failed wrenches, and blood loss from the operator (namely, YOU). The LRI Action Wrench for RugerA(R) RPR / AR-15 provides secure, non-slip 360-degree contact with the barrel nut - no way this wrench will slip off! A pinch bolt gently cinches the LRI Action Wrench to the barrel nut, eliminating offset loads that lead to slippage and damage to the barrel or its finish. Fits standard AR-15 barrel nut, DPMS LR-308 & Ruger Precision Rifl Mfg: Longrifles