Vickers K machine gun

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The Vickers K machine gun, also known as the Vickers Gas Operated (Vickers G.O.) or Gun, Machine, Vickers G.O., was a fast-firing firearm made in the United Kingdom for aircraft by Vickers-Armstrongs. It fired .303 British rounds and used a gas-operated, open-bolt action.

What it is and how it works
- It developed from the Vickers-Berthier light machine gun (adopted by the Indian Army in 1932) and featured a lighter moving mass and a breech that locked during the last part of the bolt’s travel.
- The VGO offered an adjustable rate of fire from about 950 to 1,200 rounds per minute, running faster than the German MG34.
- It normally fed from top-mounted flat pan magazines, either 60 or 100 rounds (though 96–97 rounds were often loaded to improve reliability).
- The gun could not fire through a spinning propeller because it fired from an open bolt.
- The gas cylinder sat under the barrel and used a long-stroke gas piston to drive a vertically tilting bolt.
- Weight: about 29.5 lb (13.4 kg); length: 37 in (0.93 m); barrel length: 20.8 in (529 mm); muzzle velocity: ~2,500 ft/s (760 m/s).
- Sights were iron, and it was typically mounted on ground or aircraft mounts.

In aircraft use
- The VGO was fitted to light and medium bombers and used in several aircraft turrets and positions:
- Fairey Battle, Handley Page Hampden (aircraft fitment)
- Bristol Blenheim (dorsal turret), Armstrong Whitworth Whitley (nose turret), Fairey Battle (rear cockpit)
- Royal Navy Fleet Air Arm planes such as the Swordfish, Albacore, and Barracuda
- It was originally tested with a large 300-round pan, but the wide magazine made installation in fighters difficult and potentially interfering with wing structures.
- As belt-fed Browning machine guns became standard in RAF aircraft, the VGO was phased out in RAF service, but it continued in Fleet Air Arm use until 1945.

Ground and special uses
- A land service version existed, with changes such as a shorter stock and pistol grip, plus a folding bipod and forend. This allowed mounting on jeeps and trucks for commando and reconnaissance units.
- A camera gun version was made for training, using film exposure during “firing.”
- The VGO saw use by special units:
- Long Range Desert Group (LRDG) on vehicles
- Special Air Service (SAS) on jeeps for hit-and-run tactics
- Some early airborne or reconnaissance units used it in certain roles during 1944–45
- In Navy coastal forces, it began replacing the Lewis gun on small boats from 1942.

Variants and legacy
- The Vickers K had ground-variant adaptations (Vickers G.O. Land Service) and a training camera gun version.
- Some 7.7 mm (Belgians) examples were produced before the war.
- The K/G.O. was eventually outpaced by other designs, but its high rate of fire and relatively low-friction operation gave it a niche role in various theatres through World War II.

Overall, the Vickers K was a high-fire-rate, gas-operated machine gun developed for aircraft, later adapted for ground use, and employed by British forces in multiple roles during World War II.