Bolt - Mauser KAR 98K Ceskoslovneska with bayonet, no scabbard. Manufacturer "CZ" (Ceska Zbrojovka) - Czech Arms Factory (Brno) Serial # 5345B Calibre: 8 x 57 mm Possibly a Post - WW II version. 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.