Major upgrades of the Mk 45 Mod 4 include a 62-caliber barrel, strengthened gun and mount subsystems, advanced control system enhancement, and a reduced signature, low maintenance gun shield.
The Mk 45 Mod 4 provides NSFS range of more than 20 nautical miles (36 km) with the Navy's new 5-inch Cargo projectile and an improved propelling charge.
Operation and performance of extended-range munitions are tailored for optimal effect and range in unison with the major subsystem upgrades of the Mk 45 Mod 4 Naval Gun.
Starting with DDG 81, Mk 45 Mod 4 is being forward-fit to U.S. Navy DDG 51 Class destroyers. Other Mod 4 applications include installations for the fleets of South Korea, Japan and Denmark. Existing Mk 45 Mod 0-2 mounts can be upgraded to the Mod 4 configuration, which is planned for CG 47 Class ships as part of the Navy's Cruiser Modernization Program.
BAE Systems provides more than 30 years of experience with Mk 45 Mods 0-4, with more than 240 shipboard applications in the U.S. Navy and nine fleets worldwide. Full life-cycle support is keyed to the customer and can be supplemented by the worldwide logistics system supporting the U.S. Navy.