The Gunner 3 Port Muzzle Brake is the ideal blend of usability, versatility, and recoil reduction. The 3 ports work to sequentially capture the propellant gasses and redirect them to the sides for maximum recoil reduction. On barrels of all lengths, the GUNNER reduces recoil by more than 50%!The GUNNER is 100% 3-Gun Nation, USPSA, and IDPA legal for all divisions.Specifications:Material: SteelFinish: Salt Bath NitrideThread: 1/2"-28 TPIWeight: 2.9 ounces w/ MuzzLok NutLength: 2.4 inches w/ MuzzLok NutDiameter: 0.9"Caliber: .223/5.56