Bolt, Mauser KAR 98k - SN 4359d.SN of bolt may or may not match. DO NOT KNOW SERIAL NUMBER OF BOLT THAT CAME WITH RIFLE. ********************* Rifle, Mauser KAR 98k SN 4359d. Sporterized. Bolt MAY be SN 2688/5210 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.