Compatible with Plan B type bipods. Always use an alignment rod to ensure the correct setup of the entire system. Ensure all surfaces are clean. Properly torque and secure the muzzle device with Rockset to the barrel. Note - using this on a Q can will void your warranty. Torque the muzzle device to approximately 15 ft-lb - 25 ft-lb, ensuring it is square against the shoulder. When attaching the silencer to the muzzle device, verify that the threads and tapers are clean. Torque the suppressor to 10 ft-lb and confirm alignment. The nitride finish contributes to a tighter seal, making it crucial to properly torque and secure your muzzle device to the barrel. 17-4 PH Compatible with Atlas and Atlas XL Compatible with Plan B Black nitride coating with a surface hardness of 67 HRC