Rearden MFG R2S Rainbow PVD Flash Hider M 18x1.5 Black Rainbow PVD. 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. Specifications for Rearden MFG R2S Rainbow PVD Flash Hider: Manufacturer: Rearden MFG Color: Black Rainbow Finish: PVD Package Contents: Rearden MFG R2S Rainbow PVD Muzzle Device Rearden MFG 10126: R2S Rainbow PVD Flash Hider M 18x1.5 Black Rainbow PVD