Sergei Ivanovich Mosin

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Sergei Ivanovich Mosin (pronounced "MO-seen", Russian: Сергей Иванович Мосин, May 5, 1849 - February 8, 1902) was a Russian engineer, designer of Mosin-Nagant rifle.

He entered into a military academy at age 12 where he excelled as a soldier. In 1867, he entered the Alexandrovskoye Military High School in Moscow. Upon leaving Alexandrovskoye in 1870, he decided to go to the artillery branch and transferred to the Mikhailovskoye Artillery Academy. He graduated in 1875 and transferred to the Tula Arsenal where he became the head of the machining division. It was here he began his career as a weapons designer by first making improvements to the Berdan II and later the collaboration with Nagant to design the Rifle of Three Lines of the Year 1891. Mosin eventually rose to the rank of Colonel and was appointed as the director of the Sestroretsk arsenal. He died on February 8, 1902 and was buried in Tula.