The Mosin Nagant, or 3-line rifle M1891, is a Russian military rifle developed from 1882 to 1891. A five-shot, bolt-action, internal magazine-fed rifle, the Mosin-Nagant was the most mass-produced military bolt-action rifle in history. With over 37 million units made since 1891, it is still used in various conflicts today despite being over 100 years old.