M-9 Military issue Bayonet. US Military's latest and greatest. Superior quality at a great price. The M-9 multipurpose bayonet system is used as a bayonet on the M-16 series rifle and the M-4 series carbine, as a hand weapon, as a general field and utility knife, as a wire cutter together with its scabbard, and as a saw. New original issue and includes sheath.