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U.S. Navy Orders Upgraded Mk 45 Gun Systems

The U.S. Navy recently issued a US$70.6 million contract to upgrade its existing Mk 45 naval guns to the Mod 4 configuration.

The new gun systems will feature increased firepower and extended range. 

BAE Systems will now deliver five Mk 45 naval gun systems to the U.S. Navy.

“The Mk 45 retains its reputation as the industry standard for large-caliber naval guns, and the Mod 4 makes it adaptable to advanced munitions,” said Joseph Senftle, vice president and general manager of Weapon Systems at BAE Systems.

Work on the Mk 45 Mod 4 upgrades will be performed at the BAE Systems facility in Louisville, Kentucky, with support from the company’s supplier base, and is expected to be completed by the end of 2023.

The Mk 45 is the lightest, most compact, and most widely deployed 5-inch fully automatic naval gun in the world. More than 260 have been deliveried to the U.S. Navy and the navies of 10 other allied nations.

The Mod 4 configuration consists of a structurally strengthened gun mount that increases firing energy by 50 percent, enabling munitions to travel faster and farther. A new fully digitized control system provides significantly greater computing power and a touch-screen user interface.  

Mk 45 guns are deployed on the Navy’s fleet of guided-missile Ticonderoga-class cruisers and Arleigh Burke-class destroyers.

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