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

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.

The defence giant has been awarded a contract to maintain and modernise combat management systems on Royal Navy vessels, supporting more than 200 UK jobs.

BAE Systems won a U.K. government contract worth $355.8 million to upgrade the threat detection systems on Royal Navy warships, less than a week after the U.K. said it tracked a Russian ship in British waters.

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,