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.
Chambered in the 7.62x54mmR cartridge, the Mosin-Nagant was developed to modernize Russia’s weapons. Out of the designs submitted, two were considered; one from Captain Sergei Ivanovich Mosin and the other from Leon Nagant. While Mosin’s design was accepted, Nagant filed a patent suit against Russia. The legal dispute involving Nagant and Mosin’s design later gave the rifle the misnomer of Mosin-Nagant.