50 inches

The Vickers .50 machine gun, also known as the 'Vickers .50' was similar to the .303 inches (7.70 mm) Vickers machine gun but enlarged to use a larger-calibre 0.5-inch (12.7 mm) round. It saw some use in tanks and other fighting vehicles but was more commonly used as a close-in anti-aircraft weapon on Royal Navy and Allied ships, typically in a four-gun mounting (UK) or two-gun mounting (Dutch). The Vickers fired British .50 Vickers (12.7×81mm) ammunition, not the better known American .50 BMG (12.7×99mm).

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