The Ordnance QF 3 pounder 2 cwt gun was a 47 mm British tank gun based on the Ordnance QF 3 pounder Vickers naval gun, mounted on Vickers-built tanks in the 1920s and 1930s. The gun was produced in 31 calibre and 40 calibre versions. In British service the weapon only fired a APHE round, but HE was available to the shortened version fitted to Vickers 6 ton tanks sold overseas.