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MK 75 76mm/3-inch gun

The Mark 75 three-inch gun is a capable gun in between the Mark 45 and Mark 38. Range is 10 nautical miles and is rated at 80 rounds per minute. Because of performance, lightweight and low manning requirements, the the lightweight, rapid-fire MK 75 is suited for installation on small combat vessels.

The Mark 75 was provisionally approved for service use in September 1975. The Naval Systems Division (NSD) of FMC Corporation and General Electric Co. (Ordnance Systems Division) were both licensed by the gun's designer, OTO Melara of La Spezia, Italy, and competed for the right to manufacture the MK-75 in the United States. In 1975, FMC/NSD won the competition. Since 1981, however, all MK 75 buys have been competed for by FMC/NSD and OTO Melara.

The first United States produced gun mount was delivered in August 1978. Current usage includes one gun mount each for FFG-7 Perry Class Guided Missile Frigatesf and some Navy hydrofoils, and for one gun mount each for the larger Coast Guard Hamilton and Famous Class cutters.


Primary Function Single barrel, lightweight, water-cooled, rapid fire, remote controlled, dual purpose automatic enclosed naval gun
Contractor Designed by OTO Melara, Italy
Manufactured by FMC Naval Systems Division and OTO Melara
Range 10 nautical miles (11.5 statue miles, 18.4 km)
Guidance System Remotely controlled
Type of Fire 80 rounds per minute automatic
Caliber 76 mm (3 inch)

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Maintained by Robert Sherman
Originally created by John Pike
Updated Saturday, December 12, 1998 7:17:49 AM