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MK 45 Naval Gun System
Type Naval gun
Place of origin United States

Fully-automatic naval gun mount employed against surface (Anti-Surface Warfare - ASuW), air (Anti-Air Warfare - AAW), and land attack (Naval Surface Fire Support - NSFS) targets.
The MK 45 gun was developed as a lighter weight, more easily maintained replacement for the MK 42 5"/54 caliber gun mount. It is designed to engage surface and air targets and to provide naval surface fire support for expeditionary operations. The MK 45 Mod 4 gun mount upgrade includes a longer barrel (62 caliber) that improves the gun's effectiveness as a land attack weapon (naval surface fire support).

The gun mount includes a 20 round automatic loader drum. The gun's maximum firing rate is 16-20 rounds from the loader drum per minute. The rounds in the loader drum can be fired with one crewmember located at the EP-2 console below deck. Additional rounds can be accomplished by the full crew (Mount Captain, EP-2 Operator and four ammunition handlers), all of which are stationed below deck.
General Characteristics
Primary Function Fully-automatic, naval gun mount.
Date Deployed 1971 (Mark 45 Mod 0)
Range 13 nautical miles (14.9 statute miles) with conventional ammunition
Type Fire 16-20 rounds per minute automatic, conventional ammunition
Magazine Capacity 600 rounds conventional
Caliber 5 inch 54 caliber (MK 54 Mod 1/2) barrel length of 270 inches (54 x 5"); 5 inch 62 caliber (MK 45 Mod 4 ) barrel length is 310 inches (62 x 5")
Guidance System MK 45 Gun Mount is remotely fired from the MK 160 Gun Computer System or MK 86 Gun Fire Control during normal operations
2 gun mounts per ship
1 gun mount per ship
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