Rearden MFG Mini Rainbow PVD Muzzle Device 1/2-28 Square Black Rainbow PVD. 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 Mini Rainbow PVD Muzzle Device: Manufacturer: Rearden MFG Color: Black Rainbow Finish: PVD Package Contents: Rearden MFG Mini Rainbow PVD Muzzle Device Rearden MFG 10078: Mini Rainbow PVD Muzzle Device 1/2-28 Square Black Rainbow PVD