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The Ordnance Quick-Firing 6-pounder 7 cwt, or just 6 pounder, was a British 57 mm gun, serving as a primary anti-tank gun of the British Army during World War II, as well as the main armament for a number of armoured fighting vehicles. Although planned before the start of the war, it did not reach service until the North African Campaign in April 1942. There, it replaced the 2 pounder in the anti-tank role, allowing the 25 pounder gun-howitzer to revert to its intended artillery role. The United States Army also adopted the 6 pounder as their primary anti-tank gun under the designation 57 mm Gun M1.
Its German counterpart is the PAK 40.