The ZK-383 is a heavy submachine gun of Czech origin used during World War II. Czechoslavakians used it, but only as a reserve. It was also issued to the Bulgarian military, as well as some German troops. It was in use after World War II by the Balkan states up until the 1960s.
It is sometimes considered to be a light automatic rifle, but the 9 mm Para ammunition is typical of a submachine gun. It stores the ammunition in a 30-round magazine. In addition, the gun has a bipod, a bayonet lug, and an extra long range sight, which is unusual for submachine guns.