Mod 4: longer 62-caliber barrel (versus Mod 1 and 2's 54 caliber) for more complete propellant combustion and higher velocity and thus more utility for land attack.Mod 3: same gun with a new control system never put into production.Mod 2: export version of Mod 1, but now used in the U.S.Made with a unitary construction barrel, which has a life span approximately twice that of the Mark 42 gun. Mod 1: electronic fuze setter replaces the mechanical one.Two-piece rifled construction, with replaceable liner For sustained use, the gun mount would be occupied by a six-person crew (gun captain, panel operator, and four ammunition loaders) below deck to keep the gun continuously supplied with ammunition.
These can be fired under full automatic control, taking a little over a minute to exhaust those rounds at maximum fire rate. The gun mount features an automatic loader with a capacity of 20 rounds. The gun is designed for use against surface warships, anti-aircraft and shore bombardment to support amphibious operations. The latest 62-calibre-long version consists of a longer-barrel L62 Mark 36 gun fitted on the same Mark 45 mount. It was designed and built by United Defense, a company later acquired by BAE Systems Land & Armaments, which continued manufacture. naval artillery gun mount consisting of a 127 mm (5 in) L54 Mark 19 gun on the Mark 45 mount. The 127 mm (5")/54 caliber (Mk 45) lightweight gun is a U.S. 1,500 ft/s (460 m/s) reduced charge for defilade fire or illumination roundsġ3 nmi (24.1 km) or 20 nmi (37.0 km) (Mod 4).
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