QF 4-inch naval gun Mk V
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The QF 4 inch Mk V gun was a Royal Navy gun of World War I which was adapted on HA mountings to the heavy anti-aircraft role both at sea and on land, and was also used as a coast defence gun.
QF 4 inch HA guns aboard the cruiser HMAS Sydney, 1939–1940
LA (Low Angle) gun and crew on HMS Galatea, February 1917
LA (Low Angle) gun on HMAS Vampire firing circa 1938
Crew storing fixed rounds on the Kingfisher-class sloop Widgeon, August 1943
QF 4-inch naval gun Mk XVI
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The QF 4 inch Mk XVI gun was the standard British Empire naval anti-aircraft and dual-purpose gun of World War II.
QF 4-inch naval gun Mk V
…role. It was typically used on cruisers and heavier ships, although V and W-class destroyers of 1917 also mounted the gun. Mk V was superseded by the QF 4 inch Mk XVI as the HA (i.e. anti-aircraft) gun on new warships in the 1930s, but it continued to serve on many ships such as destroyers, light and heavy cruisers…
Twin Mk XVI on HMCS Haida
Crew of a dual 4-inch at action stations aboard HMS Berwick while in screening the Atlantic Convoys in May 1943.
Twin guns of HMAS Swan bombarding shore positions in New Guinea, February 1945
Single Mk XX mounting on HMAS Barcoo, 1945