The MS-74 was based on a military rifle whose inception was in what year?
MS-74: MS-74 (№74 Factory's Modernised" Sniper rifle ") was a limited edition Soviet sniper rifle, made by Yevgeny Dragunov in 1949 at Izhevsk Machinebuilding Plant. MS-74:  The weapon was based on Mosin's rifle with 7.62×54mmR cartridge. Mosin–Nagant: The 3-line rifle M1891 (Russian: "трёхлинейная винтовка образца 1891 года" ), colloquially known as Mosin–Nagant (Russian: Винтовка Мосина , ISO 9: "Vintovka Mosina" ) is a five-shot, bolt-action, internal magazine–fed, military rifle developed by the Imperial Russian Army from 1882 to 1891, and used by the armed forces of the Russian Empire, the Soviet Union and various other nations. Mosin–Nagant:  It is one of the most mass-produced military bolt-action rifles in history with over 37 million units having been made since its inception in 1891, and, in spite of its age, it has been used in various conflicts around the world even up to the modern day.
1891