The Mosin-Nagant Model 1891 bolt-action rifle combined a simple design by Russian Capt. Sergei Mosin with a five-round internal box magazine designed by Belgians Émile and Léon Nagant.
Entering Russian service in 1892, it remained the standard long arm of the Russian infantry through the Russo-Japanese War, World War I and, in its improved 1930 Soviet version, World War II.
In 1932, the Red Army pulled Mosin-Nagants from assembly lines to modify them as sniper rifles.
Gunsmiths reconfigured the bolt handle to make room for 3.5–4x telescopic sights; raised the foresight a millimeter, allowing a sniper to use open sights on targets out to 600 meters; and lightened the trigger pull to a range of 4.4 to 5.3 pounds.
Snipers still complained about the weapon’s excessive length and weight, as well as its poor quality wooden stocks, which often warped during weather changes.
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Despite its shortcomings, the Model 1891/30 was rugged, reliable and accurate, its average minute of arc ranging from a 1.5 to below 1 (less than an inch over 100 meters).
It proved murderously successful. In fact, German snipers reportedly preferred captured Mosin-Nagants to their own Mauser Karabiner 98k rifles.
Although the Soviets also adapted the semiautomatic Tokarev SVT-40 for sniper use, it proved less accurate than the proven Mosin-Nagant, which ultimately eclipsed it.
Russia produced some 330,000 Model 1891/30 snipers between 1941 and 1943. These remained in Soviet use until replaced by the Dragunov SVD in 1963.