The Ordnance QF 6-pounder 7 cwt, or just 6 pounder, was a British 57 mm gun, their primary anti-tank gun during the middle of World War II, as well as the main armament for a number of armoured fighting vehicles. It was first used in North Africa in April 1942, and quickly replaced the 2 pounder in the anti-tank role, allowing the 25 pounder to revert to its intended artillery role. The United States Army also adopted the 6 pdr as their primary anti-tank gun under the designation 57mm Gun M1.
The idea of manufacturing the 6 pounder in the U.S. was expressed by the U.S. Army Ordnance in February 1941. At that time the U.S. Army still favored the 37mm Gun M3 and production was planned solely for lend lease. The U.S. version, classified as substitute standard under the designation 57mm Gun M1, was based on the 6 pounder Mk 2, two units of which were received from the UK, but unlike the Mk II had the original long barrel. Production started early in 1942 and continued until 1945. Sold Out!