The barrel nut torque wrench is designed for DPMS and KAC barrel nuts with 22 and 24-hole patterns. This tool enables the user to apply the precise amount of torque required when securing the barrel to the receiver. DPMS/KAC .308 barrel nut torque wrench for 22 or 24 hole pattern This wrench is incompatible with the removal of DPMS Delta ring barrel nuts due to its design specifications and torque limitations