Enjoy less felt recoil and a big reduction in muzzle flip provided by five baffles and five internal chambers. The nominal .250" exit bore MUST be opened to a minimum .020" over bullet diameter after installation. Stainless steel or unfinished brakes available via special order, please call to order. Mfg: Kdf SPECS: CM steel, blue, matte finish. 2" (5cm) long. #83 – .830" (21mm). Fits rifle muzzle diameters (DIA.) and maximum calibers (MAX. CAL) listed in chart.