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With the development of the smokeless Gewehr 88 “Commission Rifle”, the German Army finally made a serious effort to bring their cavalry units up to a modern standard. There had never been a carbine variant of the Mauser 71/84 produced, and even by the late 1880s many German cavalrymen were still carrying single shot Mauser 71 carbines - or worse, converted captured Chassepots form the Franco-Prussian War. While the Karabiner 88 wasn’t in production quite as quickly as they would have liked, guns were coming off the factory line in quantity by the summer of 1890. The factories tasked with this production were not actually the major start arsenals, but rather two private companies in Suhl - CG Haenel and VC Schilling (although the Erfurt Arsenal would step in in 1891 to make a batch of 25,000 carbines).
The Kar 88 was remarkable light and handy, and designed for use in a cavalry scabbard, meaning that it had a nice slick profile. This became a problem when the Army wanted to issue the carbines for foot artillery crews as well, because it gave them no way to stack the rifles while tending to their artillery pieces. The result was the Gewehr 91, which was identical to the Kar 88 in every way except for the addition of a stacking rod under the muzzle.
Both the Kar 88 and Get 91 were already being slowly taken out of service before World War One, as the new Mauser 98 pattern carbines introduced in 1909 or 1910 were taking their place. This would change with the outbreak of war, of course, and every one of the 88 pattern carbines in German inventory would be issued out during the Great War. Their size and weight made them ideal for the troops who needed a personal weapon but were unlikely to actually have to fight with it (artillery crews, cyclists, supply drivers, balloon crews, etc). After the war, they all disappeared form military service, though. The arms limitations of the Treaty of Versailles gave Germany no reason to keep obsolescent arms, and they were discarded in favor of keeping Mauser 98 pattern rifles and carbines.