page_title: Ordnance QF 6-pounder
section_title: Self-propelled mounts
hierarchical_section_title: Ordnance QF 6-pounder / Self-propelled mounts
caption_attribution_description: English: An American T48 57 mm GMC based on a M3 Halftrack called SU-57 by the Soviet and Polish armies.
context_page_description: 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 armoured fighting vehicles.
  Although designed 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 as an anti-tank gun, allowing the 25 pounder gun-howitzer to revert to its intended artillery role.
context_section_description: Tank gun versions of the 6-pounder were used in Crusader III, Cavalier, Centaur I and II, Cromwell I to III, Valentine VIII to X and Churchill III and IV, and also in the Canadian Ram Mk II and the prototype American Light Tank T7E2. The Deacon and the experimental Alecto Mk II self-propelled guns also mounted the 6-pounder. Another experimental vehicle armed with the 6-pounder was a Firefly tank destroyer, based on the Morris Light Reconnaissance Car. The only mass-produced vehicle mounting the 57 mm M1 was the M3 Half-track based 57 mm Gun Motor Carriage T48 (also known by its Soviet designation SU-57). The production of the T18E2 armored car also known as Boarhound, was stopped after 30 units were built. A project for a tank destroyer armed with the M1—the 57 mm Gun Motor Carriage T49—was cancelled after a single pilot vehicle was built. Similarly, the wheeled 57 mm Gun Motor Carriage T44, based on Ford 4×4 ¾ ton cargo carrier chassis, was cancelled after a brief testing.
caption: A T48 57 mm Gun Motor Carriage in front of the Polish Army Museum.
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