The popular 5C2 Flash Hider has been redesigned to work with the 6.8mm SPC cartridge, 7.62X39mm cartridge and 9mm cartridge. This 5 port design has no downward facing port which helps eliminate dust problems when shooting in the prone position. This flash hider keeps the aggressive front end for use in hand to hand situations. For 1/2"-36 threaded barrels only. Includes crush washer.