BAE Systems Receives $33.7M from U.S. Navy for Two Upgraded MK 45 Mod 4 Gun Mounts

BAE Systems Land & Armaments L.P. is being awarded a $33.67 million contract modification by the U.S. Navy for two overhauled/upgraded MK 45 Mod 4 gun mounts.

The Naval Surface Warfare Center NSWC) Indian Head Division in Indian Head, Maryland, is the contracting activity (N00174-19-C-0004).

The contract also includes associated components; Mk63 Mod 1 weather shields, Mod 4 manufacture kits, and Mod 0 gun barrels. Work will be performed in Louisville, Kentucky, and is expected to be completed by October 2025.

The MK 45 MOD 4 is a 5-inch/62 caliber U.S. naval artillery gun consisting of a 127 mm (5 in) L62 Mark 36 gun fitted on a Mark 45 mount. It is the longer barrel variant of the original Mk 45 (Mod 1 and 2) gun which is equipped with a 5 in L54 Mark 19 gun on the same Mark 45 mount.

Originally designed and built by United Defense, Mk 45 guns are now manufactured by BAE Systems Land & Armaments after the former was acquired.

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 features a touch-screen user interface. The Mod 4 upgrade is a cost-effective solution to increase capability and adaptability for advanced munitions. The modernization of these gun systems will keep them in service for decades to come.

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

Mk 45 guns are deployed on the U.S. Navy’s fleet of Ticonderoga-class guided-missile cruisers (CGs) and Arleigh Burke-class guided-missile destroyers (DDGs).



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