Rearden R2C 1/2-28 .375 Bore Rainbow PVD Flash Hider Muzzle Device

17-4 PHAtlas and Atlas XL CompatiblePlan B CompatibleAtlas Adapter Overrun Approximately 1.600Atlas XL Adapter Overrun Approximately 0.750Rainbow Black PVDShims IncludedThese fit the plan B type mounts. Always use an alignment rod to ensure that the entire system is set up correctly. Make sure all surfaces are cleaned and the muzzle device has been torqued and Rockset to the barrel. Use on a Q can voids your warranty, be warned.Torque the muzzle device to approximately 30 ft lbs. Make sure the muzzle device is square against the shoulder. When setting the silencer on the muzzle device, ensure that the threads and tapers are clean. Torque the suppressor to 10 ft lbs. Ensure alignment. Enjoy.