When these things are fired the whole magazine emptying sounds like one single shot. Caliber .380.
Tier 1 – The Professor Parabellum Acolyte (Gunnitrust)
An improvised copy of the British 9mm Sterling SMG, further hybridized with a copy of a STEN style butt-stock and magazine well. Recovered during the Cypriot unrest of the 1960s.