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High Quality Content by WIKIPEDIA articles! The QF 3 inch 20 cwt anti-aircraft gun became the standard anti-aircraft gun used in the home defence of England against German airships and bombers in World War I. It was also common on British warships in World War I and submarines in World War II. 20 cwt referred to the weight of the barrel and breech, to differentiate it from other "3 inch" guns (1 cwt = 1 hundredweight = 112 lb, hence the barrel and breech together weighed 2250 lb). While other AA guns also had a bore of 3 inches, the term "3 inch" was only ever used to identify this gun in the…mehr

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High Quality Content by WIKIPEDIA articles! The QF 3 inch 20 cwt anti-aircraft gun became the standard anti-aircraft gun used in the home defence of England against German airships and bombers in World War I. It was also common on British warships in World War I and submarines in World War II. 20 cwt referred to the weight of the barrel and breech, to differentiate it from other "3 inch" guns (1 cwt = 1 hundredweight = 112 lb, hence the barrel and breech together weighed 2250 lb). While other AA guns also had a bore of 3 inches, the term "3 inch" was only ever used to identify this gun in the World War I era, and hence this is what writers are usually referring to by "3 inch AA gun".