The Mosin–Nagant action, created in 1891 and named after the designers Sergei Mosin and Léon Nagant, differs significantly from the Mauser and Lee–Enfield bolt action designs. The Mosin–Nagant design has a separate bolthead which rotates with the bolt and the bearing lugs, in contrast to the Mauser system where the bolthead is a non-removable part of the bolt. The Mosin–Nagant is also unlike the Lee–Enfield system where the bolthead remains stationary and the bolt body itself rotates. The Mosin–Nagant bolt is a somewhat complicated affair, but is extremely rugged and durable; like the Mauser, it uses a "cock on open" system. Although this bolt system has been rarely used in commercial sporting rifles (the Vostok brand target rifles being the most recognized) and never outside of Russia, large numbers of military surplus Mosin–Nagant rifles have been sporterized for use as hunting rifles in the years since WWII.