The .380 ACP (short for "Automatic Colt Pistol" and also known as .380 Auto, 9mm Browning, 9mm Corto, 9mm Kurz, 9mm Short, 9×17mm and 9 mm Browning Court) is a rimless pistol cartridge developed by American firearms designer John Moses Browning. It was introduced in 1908 by American gun manufacturer Colt for use in its Colt Model 1908 pocket hammerless semi-automatic.
It was used by the armies of Germany, Italy, Czechoslovakia, Hungary, The Netherlands and Yugoslavia. Today, the .380 ACP cartridge is a popular choice for small pistols as the Ruger LCP, Ruger LCP II, Glock 42, Sig Sauer P238, Smith & Wesson M&P380 Shield EZ, Smith & Wesson Bodyguard, Kahr CW 380, Bersa Thunder, Walther PPK/S and others.
The .380 ACP was the cartridge responsible for the start of World War I (1914-1918). On 28 June 1914, Archduke Franz Ferdinand, heir to the throne of the Austro-Hungarian Empire, and his wife Duchess Sophie, were on a official visit in the Bosnian city Sarajevo.
They were mortally wounded when 19-year-old Gavrilo Princip took one shot at each, while they were passing by with their car, using a FN Model 1910 pistol chambered in .380 ACP.
This led directly to World War I when Austria-Hungary subsequently issued an ultimatum to the Kingdom of Serbia, which was partially rejected. Austria-Hungary then declared war on Serbia, triggering actions leading to the outbreak of World War I.
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