arsenal in Ankara. A short version, the M1871 Jägerbüchse was developed for the Jäger or light infantry and served with engineers, fortress and navy units. It was a shortened and lightened M71. A Karabiner 1871 was also developed to equipped the German cavalry but did not enter full-scale production until 1876. A shorter version of the Model 1871, the M1879 Grenzaufsehergewehr, was issued to the border guards in 1880. It shot a unique 11.15×37.5mmR cartridge, a trimmed down version of the full-power military cartridge. Various German arsenals and the Austrian company Steyr also manufactured the M71 rifle. Serbia adopted a more up-to-date version of the rifle in 1881, the M1878/80, still single-shot, but chambered in its own 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" (rifling which increases in twist rate as the bullet travels up the bore, to more gradually impart spin) developed by the Serbian Major Kosta "Koka" Milovanović (Коста "Кока" Миловановић), and it is commonly known as "Mauser-Koka", "Mauser-Milovanović", or "Kokinka" ("Кокинка"). The muzzle velocity of the Mauser-Koka was . It saw first combat in the Serbo-Bulgarian War. Approximately 110,000 Mauser-Koka rifles entered the Serbian arsenal. Starting 1907, about half of these were converted in Kragujevac to shoot the 7×57mm from a 5-shot box magazine; the new barrels were purchased from Steyr. Both the old and new guns (designated M80/07) saw action in the Balkan Wars and World War I. The converted M80/07 are often referred to as "Đurić Mausers" (Ђурић-Маузер). In 1894, Uruguay had their stockpile of M71 rifles converted to smokeless 6.5×53.5mm SR (Daudeteau system) by Société Française d'Armes Portatives Saint Denis in France. They were given new stocks, barrels, sights, bands, and side-mounted cleaning rods. However, the initial batch of ammunition that was sent with the rifles was incorrect and unusable in the guns. Service The M71 was used by the Korean Empire Army (especially Guard units—this rifle replaced the Russian Berdan rifle). The number of rifles used is uncertain but the Korean Empire manufactured ammunition for them, which means that the Korean Empire used a respectable number of them. From 1876, the Chinese Qing dynasty bought M71 rifles and carbines from Mauser, Steyr and Spangenberg&Sauer. After the Germans adopted the Gewehr 1888, over 1,000,000 discarded Model 1871 and 1871/84 were put into Chinese service. The South African Republic