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Ordnance QF 6-pounder

The Ordnance Quick-Firing 6-pounder 7 cwt, or just 6-pounder, was a British 57 mm gun, serving during the Second World War as a primary anti-tank gun of both the British and United States Army. It was also used as the main armament for a number of... Wikipedia
Shell: Fixed QF 57×441 mmR
Barrel length: Mk II, III: 8 ft 4 in (2.54 m) 43 calibres; Mk IV, V and M1: 9 ft 3 in (2.82 m) 50 calibres
Designed: 1940
Height: 4 ft 2 in (1.28 m)
In service: 1942–1960
Sights: No.22c
Used by: Allies of World War II; and other users