BAE Systems has received a contract from the US Navy to overhaul and upgrade Mk 45 systems on its Destroyer-class (DDG) ships.
Valued at $80m, this initial contract will cover the upgrade of six guns to the Mod 4 configuration.
The contract also includes an option for four additional guns. The options, which will bring the total value of the contract to $130m, are expected to be exercised next year.
BAE Systems Weapon Systems vice-president and general manager Joseph Senftle said: "Our combat-proven Mk 45 Naval Gun System provides ships with an effective weapon for anti-surface, strike, fire support, and anti-air warfare combat.
"This award strengthens our position in large calibre guns and promotes the United States' naval gun industrial base."
The upgrade to the Mod 4 capability include a 62-calibre barrel, strengthened gun and mount subsystems, enhanced advanced control systems, a reduced signature, and low maintenance gun shield.
According to BAE, the enhancements are aimed to support potential increased ranges for Naval Surface Fire Support achieved through future extended range guided munitions.
Delivery of the first upgraded gun is expected in October 2017, while the last delivery is scheduled for January 2020.
The company will perform the work under this contract in Louisville, Kentucky, with the support of its facility in Minneapolis, Minnesota.
The Arleigh Burke-class destroyers provide anti-submarine, anti-air and anti-surface capabilities for the navy, while also support carrier battle, surface action, amphibious and replenishment groups.
Image: The upgrade will see the conversion of six guns to the Mod 4 configuration. Photo: courtesy of BAE Systems.