Mk 42 Naval GunMk 42 Naval Gun

The 5-Inch 54-Caliber Mk 42 Naval Gun was developed and manufactured by United Defense. The Mk 42 Naval Gun is widely deployed, with more than 70 applications in 10 international fleets. United Defense-Louisville is the In-Service Engineering Agent (ISEA)-certified depot-level overhaul point for Mk 42 systems now serving in international fleets. United Defense-Louisville is also ISEA-certified for repair, overhaul, upgrade, and logistics support center for the Mk 42 Gun Fire Control System Mk 68.Destroyers and frigates equipped with the Mk 42 Naval Gun have an effective weapon for antisurface, fire support, and strike warfare missions. The Mk 42 Naval Gun has the capability to rapidly fire all semifixed 5-inch 54-caliber ammunitions with point detonation, proximity, and mechanically timed fuze configurations.Mk 42 At SeaThe Mk 42 Naval Gun consists of two component groups: the lower structure (below deck) and the upper structure (above deck). Lower structure components include parallel 2-stage hoist/loader drum arrangements that deliver an uninterrupted flow of ammunition to the gun. Upper structure components load the ammunition, aim the gun, fire the ammunition, and eject the empty powder cases. Depot-Level OverhaulUnited Defense combines its experience as the Mk 42 original equipment manufacturer with United Defense-Louisville’s proud tradition as the ISEA-certified depot overhaul point. The Mk 42 Naval Gun support services can be provided aboard ships located anywhere in the world, and at our pierside facilities in Norfolk, VA; Mayport, FL; and San Diego, CA; or at the United Defense-Louisville depot overhaul facility.United Defense-Louisville. We’re continuing to demonstrate our commitment to defense, now and into the future.