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The Ordnance quick-firing 6-pounder 7 cwt, [note 1] 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 (as the 57 mm gun M1). It was also used as the main armament for a number of armoured fighting vehicles.
Ordnance QF 17- pounder: Anti-tank gun 76.2 mm 3 inch Ordnance QF 18- pounder: Field gun 83.8 mm 3.3 inch Ordnance QF 20-pounder: Tank gun 83.8 mm 3.3 inch Ordnance QF 25-pounder: Gun-howitzer 87.6 mm 3.45 inch Ordnance QF 32-pounder: Tank gun 94 mm 3.7 inch Ordnance QF 60-pounder: Heavy field gun 127 mm 5 inch
The Ordnance QF 6-pounder 6 cwt Hotchkiss Mk I and Mk II was a shortened version of the original QF 6 pounder Hotchkiss naval gun, and was developed specifically for use in the sponsons of the later marks of British tanks in World War I, from Mark IV onwards.
6-pounder gun or 6-pdr, usually denotes a 57-millimetre (2.2 in) gun firing a projectile weighing approximately 6 pounds (2.7 kg). Guns of this type include: QF 6 pounder Hotchkiss , a 57 mm naval gun of the 1880s; a similar weapon was designed by Driggs-Schroeder for the US Navy
The Ordnance QF Hotchkiss 6 pounder gun Mk I and Mk II or QF 6 pounder 8 cwt were a family of long-lived light 57 mm naval guns introduced in 1885 to defend against new, small and fast vessels such as torpedo boats and later submarines. Many variants were produced, often under license, which ranged in length from 40 to 58 calibers, with 40 ...
The Ordnance QF 75 mm, abbreviated to OQF 75 mm, was a British tank gun of the Second World War.It was obtained by boring out the Ordnance QF 6-pounder ("6 pdr") 57 mm anti-tank gun to 75 mm, to give better performance against infantry targets similarly to the 75 mm M3 gun fitted to the American Sherman tank.
Mk II followed the early weakly made and less powerful Mark I 80-pounder and introduced a 100-pound projectile, which became standard for British 6-inch guns until 1930. It consisted of a much thicker steel barrel with wrought-iron jackets shrunk over it and as originally introduced weighed 81 cwt (9720 pounds).
In British service it was known as the QF 6-inch Mk I, II, III guns. [ note 1 ] As the 15 cm/40 (6") 41st Year Type naval gun it was used for pre-dreadnought battleships , armoured cruisers and protected cruisers of the early Imperial Japanese Navy built in UK and European shipyards.