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A Beretta 92 is a pistol and is one of the most famous pistols of the Italian company Beretta. It fires 9x19mm cartridges and it can hold 15 of them. It is the standard side-arm of many police and military units and the United States Army. In the US Army, the pistol got the name M9.
After the US military ended its ban on foreign-made weapons, its allies in NATO pressured the US to adopt a 9mm handgun to replace the M1911 because NATO has a rule that all NATO countries must use weapons with the same kinds of ammunition.