This is very good example of a fairly scarce Yugoslavian Type 56 submachine gun chambered in the Russian 7.62x25 pistol cartridge. This was an indigenous designed submachine gun intended to capitalize on the standard Russian pistol round in use by the Warsaw Pact countries. This design appears to be an updated/improved copy of the German MP-40 in that is uses a round receiver tube, fixed front and two position rear sights, a plastic receiver cover with a stamped pistol grip assembly and a twin bar folding stock. Blow-back operated open bolt with a fixed firing pin. The top of the receiver is stamped with the large Communist Yugoslavian crest over "M-56/E-88359". Many of the parts have a 6 or 7 digit part numbers stamped on them. The right side of the barrel is marked "ZASTAVA YUGOSLAVIA 7.62/INTER AMERICAN SACTO. CA."