In 1880, Serbian Major Kosta "Koka" Milovanović (Коста "Кока" Миловановић) developed an updated version of the Mauser Model 1871, still single-shot, but chambered in its proprietary 10.15×63R 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.
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