The Mark 42 5"/54 caliber gun is a naval gun mount used by the United States Navy and other countries. It consists of the Mark 18 gun and Mark 42 gun mount. United States naval gun terminology indicat
5 inch/54 Mark 42 on USS Turner Joy
Two of the eight turrets of the carrier USS Ranger firing, in 1961.
Side profile of the 5-inch gun from HMAS Brisbane
The 5-inch /54-caliber lightweight gun is a U.S. naval artillery gun mount consisting of a 5 in L54 Mark 19 gun on the Mark 45 mount. The later 62-calibre-long version consists of a longer-barrel L62
5-inch/54-caliber Mark 42 gun
…antiaircraft gunner position was scrapped later on when the increasing speed of naval aircraft made manual aiming of anti aircraft weapons impractical. The Mark 45 lightweight (22.1 long tons (22.5 t)) gun mount began replacing the Mk 42 mount in 1971 for easier maintenance and improved reliability in new naval construction…
5-inch/62-caliber Mark 45 Mod 4, in flat-panel gun turret, test firing on USS Forrest Sherman
Mod 2
Mod 4
A Mod 2 gun aboard the Australian Anzac-class frigate HMAS Arunta