QF 12-pounder 12 cwt AA gun

Ordnance QF 12 pounder 12 cwt anti-aircraft gun
Mk I* on World War I AA traveling platform mounting
Type	Anti-aircraft gun
Place of origin	United Kingdom
Service history
In service	1914–1918 (as land AA gun)
Used by	United Kingdom Kingdom of Italy Empire of Japan
Wars	World War I World War II
Production history
Designed	1893
Manufacturer	Elswick Ordnance Company Vickers
Variants	Mk I, Mk II
Specifications
Barrel length	12 ft (3.7 m)
Shell	Fixed or separate QF 12.5 lb (5.7 kg)
Calibre	3 inch (76.2 mm)
Breech	single-motion screw
Recoil	Hydro-spring, constant, 12 in (300 mm)
Elevation	0° - 85°
Traverse	360°
Muzzle velocity	2,200 ft/s (670 m/s)
Maximum firing range	20,000 ft (6,100 m)[1]

The 12 pounder 12 cwt anti-aircraft gun was a British anti-aircraft gun of the First World War, The guns were QF 12 pounder 12 cwt naval guns taken from coast defence positions with the addition of a modified cradle for higher elevation, a retaining catch for the cartridge, and an additional spring recuperator above the barrel and high-angle sights. Writers commonly refer to it simply as "12 pounder anti-aircraft gun".^{[citation needed]} 12 cwt referred to the weight of the barrel and breech - 1,344 lb (610 kg) - to differentiate it from other 12-pounder guns.