Firearms, Jazz, and Dinosaurs
The North Vietnamese K-50M. It is a license-built copy of the Chinese Type 50 submachine gun which is in turn a copy of the Soviet PPSh-41.
Notable differences from the Type 50 and PPSh include a shortened barrel shroud, a telescoping steel wire buttstock, a pistol grip, and a new front sight.

The North Vietnamese K-50M. It is a license-built copy of the Chinese Type 50 submachine gun which is in turn a copy of the Soviet PPSh-41.

Notable differences from the Type 50 and PPSh include a shortened barrel shroud, a telescoping steel wire buttstock, a pistol grip, and a new front sight.