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.
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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.