QF 4-inch naval gun Mk XVI

while in screening the Atlantic Convoys in May 1943. The Mk XVI superseded the earlier QF 4 inch Mk V naval gun on many Royal Navy ships during the late 1930s and early 1940s. The ammunition fired by the Mk V gun and the Mk XVI guns were different. The ammunition for the Mk V gun was long and weighed , while the ammunition fired by the Mk XVI gun was long and weighed . The weight of the high-explosive projectile grew from for the Mk V to for the Mk XVI. There were three variants of the gun produced with differing construction methods. The original Mk XVI had an A tube, jacket to from the muzzle and a removable breech ring. The Mk XVI* replaced the A tube with an autofretted loose barrel with a sealing collar at the front of the jacket. The Mk XXI was a lighter version with an autofretted monobloc barrel and a removable breech ring. The total number of Mk XVI and XVI* guns produced was 2,555, while there were 238 Mk XXI guns produced. Of those totals, 604 Mk XVI* and 135 of the Mk XXI guns were produced in Canada and 45 of the Mk XVI* were produced in Australia. These guns were usually mounted on HA/LA Mark XIX twin mountings, although several Australian frigates and corvettes had single-gun Mk XX mountings. The last Royal Navy ship to operate with a Mark XIX twin mounting was , which had originally been designed for the Ghana Navy and so required a simple and inexpensive main armament. Acquired by the British Government in 1972, she served until 1977 when she was purchased by the Royal Malaysian Navy and renamed KD Hang Tuah. ==List of equipped vessels==

As secondary armament (list not complete) • Aircraft carriers: , • Escort carriers: s, HMS Pretoria Castle, HMS Activity • • s (converted to anti-aircraft cruisers) • , , • s • s • • s • s • s • s • s • s • s • • • As main armament (list not complete) • s • s • (the first series L: HMS Gurkha, Lance, Legion, Lively) • (modified) • s • s (after WAIR modification – 15 ships) • (after WAIR modification) • s • Some s (single-gun Mk XX mounting) • s • s • (modified) • (modified) • s • s (part of Canadian-built) • 8 auxiliary AA defence ships • Some landing ships Allied ships fitted out in Britain • (Polish) • (Dutch) • (Dutch) • 4 French Elan-class avisos and s Post-war construction ships • Type 15 frigates (converted) • Type 16 frigates (converted) • SAS Jan van Riebeeck and Simon van der Stel converted frigates (South Africa) • NNS Nigeria frigate (Nigerian) • Vosper Mk 3 corvettes (NNS Dorina and Otobo) (Nigerian) The South African Navy s (HMSAS Good Hope and HMSAS Transvaal) each had two of these guns mounted on a twin Mark XIX mount on their foredeck between 1955 and 1976. ==Ammunition==

HMAS Swan guns (079323).jpg|Twin guns of bombarding shore positions in New Guinea, February 1945 HMAS Barcoo QF 4 inch Mk XVI single mount breech AWM 119466.jpg|Single Mk XX mounting on , 1945 The Royal Navy during the Second World War HMS Glasgow 4-inch AA gun crew A 21143.jpg|Gunners of clearing empty cartridges after a shoot Gunners with 4 inch rounds HMS Vivien 1940 IWM A 1770.jpg| HMS Belfast - 4 inch guns - shell loading 1.jpg| ==See also==

• Front Lawn of HMCS York, Toronto, Ontario, Canada • On , Hamilton, Ontario, Canada. • A pair in turret from HMCS Huron (G24) at the Royal Military College, Kingston, Ontario, Canada • Naval Museum of Alberta, Canada • HMCS Unicorn, Saskatoon, Saskatchewan, Canada. • Trenton Park, Trenton, Nova Scotia, Canada • On , London, which retains four twin guns. • Explosion! Museum of Naval Firepower, Gosport, Hampshire, UK • On , Gdynia (re-bored to 100 mm). • A pair at South African National Museum of Military History, Johannesburg • A pair in a turret from INS Haifa (K-38), at Clandestine Immigration and Naval Museum, Haifa, Israel. • Two single guns on , Brisbane, Australia • One twin gun at the Marinemuseet, Horten, Norway. • One twin gun in the Aldhurst military vehicles collection, Surrey England. Further research has proven the left gun was installed on the heavy cruiser HMS Devonshire from 1943 until she was scrapped in 1954. ==Notes==