QF 6-pounder 6 cwt Hotchkiss The was a shortened version of the original Ordnance QF 6-pounder 6 cwt Hotchkiss Mk I and Mk II 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. HistoryThe original QF 6 pounder naval gun had turned out to be too long for practical use with the current British heavy tank designs, which mounted guns in sponsons on the side rather than turrets on top as modern tanks do. The muzzles of the long barrels sometimes dug into the mud or struck obstacles when the vehicle crossed trenches or shell craters. The shortened of single tube construction was introduced in QF 6 pounder 6 cwt Mk I January 1917 in the Mark IV tank, and may be considered the world's first specialised tank gun. The shortened barrel incurred a reduction in muzzle velocity, but as tank guns in World War I were used against unarmoured or lightly armoured targets such as machine gun nests and artillery pieces at relatively short ranges of a few hundred yards, this was not a major disadvantage. The Mk II gun was developed at the same time, having a built-up barrel construction. World War IIThe gun was reused in the Second World War, being fitted to the 12 Armoured Trains operated in the United Kingdom. Just as with the tank mounting, the short barrel was an advantage, preventing fouling of line-side structures and bridges. The last British armoured trains were decommissioned in 1944.
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