The Mark 12 5"/38-caliber gun was a United States dual-purpose naval gun, but also installed in single-purpose mounts on a handful of ships. The 38-calibers long barrel was a mid-length compromise bet
Two Mk 30 single enclosed base ring mounts on USS David W. Taylor
Vertical Sliding Wedge Breech Block.
Drawing of the recoil and counter-recoil systems. The arrow shows the motion of the housing in the slide during recoil.
The QF 4.5 inch gun has been the standard medium-calibre naval gun used by the Royal Navy as a medium-range weapon capable of use against surface, aircraft and shore targets since 1938. This article c
Mk III guns in BD 'RP10' Mk II mountings on Implacable-class aircraft carrier. A King George V-class battleship (1939) can be seen in the background.
Gunner with early fixed round, 1942
Twin Mark III guns on Illustrious-class aircraft carrier HMS Formidable
The Battle-class destroyer HMS Dunkirk, with two twin mountings BD Mark IV for Mark III guns.