 The knife bayonets are basically fighting knives or utility knives with a lug and/or muzzle ring to attach to the barrel of a firearm such as an assault rifle or submachine gun.Almost all bayonets today are knife bayonets that are designed for use in hand-to-hand fighting and as utility knives.Some have serrated (saw-blade) back edges for utility and be usable as wire cutters (when used in conjunction with fittings on the sheath).