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QF 4 inch Mk XVI naval gun

Ordnance QF 4 inch gun Mk XVI
Twin Mk XVI on HMCS Haida
Type Naval gun
Naval anti-aircraft gun
Place of origin  United Kingdom
Service history
In service 1936-[1]-1950s
Used by Royal Navy
Royal Canadian Navy
Royal Australian Navy
South African Navy
Wars World War II
Korean War
Weight Barrel & breech 4,495 lb (2,039 kg)
Barrel length 180 inches (4,572 mm) (45 cal))

Shell Fixed QF 35 pounds (15.88 kg) HE
38.25 pounds (17.35 kg) S.A.P.
Calibre 4-inch (101.6 mm)
Breech vertical sliding block
Recoil hydro - pneumatic 831 millimetres (33 in)
Elevation mounting dependent (-10 to 80 deg on H.A. twin mark XIX mount)[2]
Traverse mounting dependent
Muzzle velocity 2,660 feet per second (811 m/s)
Filling weight 9 pounds (4.08 kg)

The QF 4 inch Mk XVI gun[3] was the standard British Commonwealth naval anti-aircraft and dual-purpose gun of World War II.


  • Service 1
  • Ammunition 2
  • See also 3
  • Surviving examples 4
  • Notes 5
  • External links 6


The Mk XVI superseded the earlier QF 4 inch Mk V naval gun on many Royal Naval ships during the late 1930s and early 1940s. These guns were usually mounted on HA/LA Mark XIX twin mountings, although several Australian frigates and corvettes had single-gun Mk XX mountings.

As secondary armament (list not complete):

As main armament (list not complete):

Allied ships modified in the United Kingdom:

The South African Navy Loch-class frigates (HMSAS Good Hope, HMSAS Natal and HMSAS Transvaal) each had two of these guns mounted on a twin Mark XIX on their foredeck between 1944 and 1976.


See also

Surviving examples


  1. ^ "British 4"/45 (10.2 cm) QF HA Marks XVI, XVII, XVIII and XXI". NavWeaps. Retrieved 2008-08-25. 
  2. ^ "THE 4-in. Q.F. MARK XVI* GUNS ON THE H.A. TWIN MARK XIX MOUNTING.". Retrieved 2008-08-25. 
  3. ^ Mk XVI = Mark 16. Britain used Roman numerals to denote marks (models) of ordnance until after World War II. Mark XVI indicates this was the sixteenth model of QF 4 inch gun.

External links

  • B.R. 257. Handbook for the 4 inch Q.F. Mark XVI* Gun on the H.A. Twin Mark XIX And Single Mark XX Mountings. G3821/41 Naval Ordnance Department, Admiralty, July 1941.
  • Tony DiGiulian, British 4"/45 (10.2 cm) QF HA Marks XVI, XVII, XVIII and XXI
  • Youtube video clip of demonstration of loading and firing on HMS Belfast
  • Youtube video clip of demonstration of loading and firing on HMS Belfast : closeup Note : for safety reasons, cartridges are seen being loaded without the normal attached shell.
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