Set of two Vickers K G.O. Mark I machine guns.
The Vickers K machine gun, known as the Vickers Gas Operated or Gun, Machine, Vickers G.O..303-inch in British service, was a rapid-firing machine gun developed and manufactured for use in aircraft by Vickers-Armstrongs. The high rate of fire was needed for the short period of time when the gunner would be able to fire at an attacking aircraft.