. . "In 1880, Serbian Major Kosta \"Koka\" Milovanovi\u0107 (\u041A\u043E\u0441\u0442\u0430 \"\u041A\u043E\u043A\u0430\" \u041C\u0438\u043B\u043E\u0432\u0430\u043D\u043E\u0432\u0438\u045B) developed an updated version of the Mauser Model 1871, still single-shot, but chambered in its proprietary 10.15\u00D763R caliber. It had unique additions in that it had a bolt guide (much like the M1870 Italian Vetterli) and the \"progressive rifling\" that was developed by Koka. The Kingdom of Serbia adopted the rifle in 1881."@en . . . "1.35"^^ . "Serbian Model 1878/80 (Mauser-Koka)"@en . . . . "4500.0"^^ .