The MK760 (Smith and Wesson 76) Submachine Gun October 4, 2018 Unipro2013main Military Weapons, Modern Small Arms Submachine GunThe Smith & Wesson M76 submachine gun was produced by Smith & Wesson from 1967 to 1974. It is an adaptation of the Swedish Carl Gustav m/45 with an open bolt design and fires 9x19mm Parabellum ammunition.