Vickers .5 inch machine gun

Vickers .50 machine gun
A Vickers .50 machine gun, Polish Army Museum, Warsaw (2006)
Type	Machine gun Anti-aircraft gun
Place of origin	United Kingdom
Service history
In service	1932-?
Used by	United Kingdom Ireland
Wars	World War II
Production history
Manufacturer	Vickers
Variants	Marks I - V
Specifications (Vickers .5 Mk V)
Weight	63 pounds (29 kg) (includes 10 pounds (4.5 kg) cooling water)
Length	52.4 inches (1,330 mm)
Barrel length	31 inches (790 mm)
Cartridge	12.7x81mmSR ()
Calibre	0.5 inches (12.7 mm)
Rate of fire	500-600 rounds per minute
Muzzle velocity	2,540 feet per second (770 m/s)
Maximum firing range	Altitude : 9,500 feet (2,900 m) Range: 4,265 yards (3,900 m)
Feed system	belt

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

Mark I was the development model.

Mark II entered service in 1933 and was mounted in some British tanks. Marks IV and V were improved versions and were also used mounted on trucks in the North Africa Campaign. It was superseded for use in armoured fighting vehicles (AFVs) during World War II by the 15 mm (0.59 in) Besa.

Mark III was a naval version used as an anti-aircraft weapon, mostly by the Royal Navy and allied navies in World War II, typically in mountings of 4 guns. It proved insufficiently powerful in the short-range anti-aircraft role against modern all-metal aircraft and was superseded during World War II by the Oerlikon 20 mm cannon. The naval quad mount featured a 200-round magazine per barrel, which wrapped the ammunition belt around the magazine drum, and provided a maximum rate of fire of 700 rounds per minute, per gun. The four-barrel mounting had its guns adjusted to provide a spread of fire, amounting to 60 feet wide and 50 feet high at 1,000 yards (15–18 m at 915 m). Vickers claimed that it could fire all 800 rounds in 20 seconds and could then be reloaded in a further 30 seconds.

During the Second World War it was also mounted on power-operated turrets in smaller craft such as Motor Gun Boats and Motor Torpedo Boats.