The company will extend the barrel of the Mk 45, strengthen the gun mounts and incorporate a fully digital control system.

The U.S. Navy has awarded BAE Systems over $70 million to upgrade Mk 45 5-inch naval gun systems and ancillary equipment.

The US Navy has contracted BAE Systems to upgrade Mk 45 5-inch naval gun systems, including the overhaul of existing systems, to the Mk 45 Mod 4 configuration. This modification, worth $23.5m, supplements a prior $47m contract,

Britain has awarded a 285-million-pound ($355.57 million) contract to London-listed BAE Systems to upgrade the Ministry of Defence's Royal Navy combat systems, the government said on Tuesday.