Together with Leon Nagant he was the designer of the Three Line Rifle or....the Mosin Nagant as the rifle was called in the west.

....buried in Tula.
Sergei Ivanovich Mosin, May 5th 1849 - February 8th 1902
Leon Nagant (1833-1900)
If it wasn't for Mosin, I'd be collecting Nagant rifles now.
Met vriendelijke groet,
Martin