QF 4-inch naval gun Mk V

Ordnance QF 4 inch gun Mk V
QF 4 inch HA guns aboard the cruiser HMAS Sydney, 1939–1940
Type	Naval gun Anti-aircraft gun Coastal defence gun
Place of origin	United Kingdom
Service history
In service	1914 - 1945
Used by	British Empire
Wars	World War I World War II
Production history
No. built	944[1]
Specifications
Mass	Barrel & breech: 4,890 lb (2,220 kg)[2]
Barrel length	Bore: 15 ft (4.6 m) (45 cal) Total: 15 ft 8 in (4.8 m)[2]
Shell	31 lb (14.1 kg) fixed QF or Separate-loading QF
Calibre	4-inch (101.6 mm)
Breech	horizontal sliding-block
Recoil	hydro-pneumatic or hydro-spring 15 inches (380 mm)
Elevation	mounting dependent
Traverse	mounting dependent
Muzzle velocity	2,350 ft/s (716 m/s)[2]
Maximum firing range	Surface: 16,300 yd (15,000 m)[3] AA: 28,750 ft (8,800 m)[2]
Filling	Lyddite, Amatol
Filling weight	5 pounds (2.27 kg)

The QF 4 inch Mk V gun^{[note 1]} was a Royal Navy gun of World War I which was adapted on HA (i.e. high-angle) mountings to the heavy anti-aircraft role both at sea and on land, and was also used as a coast defence gun.

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