QF 3-inch 20 cwt
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The QF 3-inch 20 cwt anti-aircraft gun became the standard anti-aircraft gun used in the home defence of the United Kingdom against German Zeppelins airships and bombers and on the Western Front in World War I. It was also common on British... Wikipedia
Shell: Fixed QF HE 76.2 × 420 mm R
Breech: Semi-automatic sliding-block
Crew: 11
Effective firing range: 16,000 ft (4,900 m)
Maximum firing range: 23,500 ft (7,200 m), 12.5 lb shell; 22,000 ft (6,700 m), 16 lb shell
Place of origin: United Kingdom
Rate of fire: 16–18 rpm