The popular 5C2 Comp/Flash Hider is one of the oldest, most well known products YHM has made. It is designed for 5.56mm Cartridge. This 5 port design has no downward facing port which helps eliminate dust problems when shooting in the prone position. This flash hider has an aggressive front end for use in hand to hand situations, but we also manufacture a smooth version for those who may not like the aggressive endcuts. For 1/2"-28 threaded barrels only. Includes crush washer. Muzzle device length is 2.225" w/.155" crush washer - 2.38". Length added to barrel is 1.755" (on barrels with 0.6" threads). Length: 2.125"