The Vickers K was a development of the Vickers-Berthier (VB) light machine gun, adopted in 1932 by the Indian Army.[1] The VB, like the Bren light machine gun, used a tilting locking breechblock. However, unlike the Bren, the VB locked its breech only at the last moment of forward travel and this enabled the development of the Vickers K also known as the "Vickers Gas Operated" (VGO) or "Vickers GO" .[1] With lighter moving parts and the VB locking design, the Vickers K had an adjustable rate of fire between 950 and 1,200 rounds per minute; faster than the German MG34.[1] The weapon was adopted for British service as the VGO. It was test-flown with a large 300-round drum, and beat the .303 Browning in reliability. However, the wide drum would have caused problems to accommodate, since it would have interfered with wing structures. When the belt-fed Browning Mark II was selected as the standard machine-gun armament for RAF aircraft, the VGO became redundant for the RAF. It continued to be used by the Fleet Air Arm until 1945.