3 Port Brake featuring our Dual Taper Locking System(TM), compatible with our Radiant762, Surge 7.62, Razor 7.62 and Micro30.This muzzle device is designed for reducing recoil when shooting unsuppressed. The 3 Port Brake has a .30 cal aperture, but the 1/2x28 variation can be permanently attached to 5.56 cal 14.5 inches barrels in order to meet 16 inches requirements. Features: 30 cal aperture Dual taper locking system