Beretta M1934 semi-automatic pistol, an iconic Italian service sidearm used during and after World War II. Description Design: The M1934 is a compact, simple, and reliable blowback-operated pistol known for its open slide design which ensures reliable feeding and extraction. Caliber: It is typically chambered in 9x17mm Corto, more commonly known as .380 ACP.Capacity: It uses a single-stack, 7-round detachable box magazine. History: Designed in the early 1930s, it became the standard military sidearm of fascist Italy and saw extensive service with Italian troops, police forces, and other nations well into the 1980s.