M1915 Villar Perosa
The M1915 Villar Perosa, a contender for the first submachine gun, was initially designed as an aircraft observer's weapon for WWI. Its dual-barrel system fired at an extremely high rate (up to 3000 RPM) using 9mm Glisenti cartridges, effective against early aircraft. Later adapted for ground combat, it evolved into iconic submachine guns like the Beretta M1918.









