Villar Perosa aircraft submachine gun
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The Pistola Mitragliatrice Fiat Mod. 1915, commonly nicknamed the Villar Perosa, was an Italian portable automatic weapon developed during World War I by the Officine di Villar Perosa. Wikipedia
Action: Delayed Blowback
Barrel length: 320 mm (13 in)
Cartridge: Glisenti M.915 Per Mitragliatrici, 9x23mm Steyr (Sturm-Pistole),.455 Webley (Trials only)
Designed: 1914
Feed system: 2 25-round box magazines
Place of origin: Italy
Rate of fire: 1200-1500 rounds/min per barrel, 2400-3000 total