SPECIFICATIONS:Two chambers divert blast to the sides, reducing in-line recoil, while three vertical high-pressure ports prevent muzzle climb (.223/.308)Two horizontal ports on the .223/.308 are threaded to allow set screw installation, allowing the shooter to optimize the compensator for right- or left-handed shooting (one screw included)Black nitride finished for durability and corrosion resistance.223 and 9mm threaded 1/2×28, .308 threaded 5/8×24Includes crush washer