The Ordnance QF 13 pounder Mk III anti-aircraft gun also known as 13 pounder 6 cwt was an early British improvisation in World War I to adapt the 13 pounder field gun to anti-aircraft use. 6 cwt referred to the weight of barrel and breech (6 x 112 lb = 672 lb) to differentiate it from other 13 pounder guns.
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