OQF 3 pounder gun

Ordnance QF 3 pounder gun Mk I, Mk II
On a Medium Mk II (special) tank at the Royal Australian Armoured Corps Tank Museum, Puckapunyal, Victoria, Australia
Type	Tank gun
Place of origin	United Kingdom
Service history
In service	1924–1940
Wars	World War II
Production history
Variants	Mk I, Mk II
Specifications
Barrel length	1.5 m (4 ft 11 in) bore (32 cal) or 1.88 m (6 ft 2 in) (40 cal)
Shell	47x351R. 1.47 kg (3 lb 4 oz) shell.
Calibre	47-millimetre (1.85 in)
Muzzle velocity	560 m/s (1,840 ft/s) (40 cal gun)

The Ordnance QF 3 pounder gun was a 47 mm British tank gun based on the Ordnance QF 3 pounder Vickers naval gun, mounted on in the 1920s and 1930s. The gun was produced in 32 calibre (59 inch) and 40 calibre (74 inch) versions.