Three full chambers and seven exhaust ports combine to help control recoil and muzzle climb to put you back on target faster. Installation is as easy as fitting a new barrel bushing. Fits all calibers of Govt.-length barrels with O.D. of .576' to .580'. Requires minor fitting and a full-length, two-piece guide rod. SPECS: Steel, blued, matte finish. 2' (4.8cm) long.