Rearden MFG 10088 R2S, 1/2x28 Threads, .40 Bore, Rainbow Finish, Square Shoulder

17-4 PHAtlas and Atlas XL CompatiblePlan B CompatibleRainbow Black PVDShims not 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 mu