The Rugged Suppressors 3 Port Brake features Rugged's Dual Taper Locking System which is compatible with the Radiant762, Surge762, Razor762 and Micro30 suppressors. The 3 Port Brake is designed for reducing recoil when shooting unsuppressed. The 3 Port Brake has a .30cal aperture, but the 1/2x28 variation can be permanently attached to 5.56 14.5? barrels in order to meet 16? requirements.