German Mauser KAR 98k Bayonet Scabbard. WW II. The Karabiner 98k rifle was designed to be used with an S84/98 III bayonet and was accompanied by a bayonet frog. The Karabiner 98 Kurz (Kar98k, K98, or K98k) is a bolt action rifle chambered for the 7.92×57mm Mauser cartridge that was adopted on 21 June 1935 as the standard service rifle by the German Wehrmacht. Although supplemented by semi- and fully automatic rifles during World War II, it remained the primary German service rifle until the end of the war in 1945.