BAE Systems Upgrade USN Guns – the UK owned BAE Systems has  received a $ 25.7 million contract from the United States Navy to overhaul and upgrade two Mk 45 naval guns bringing them to the 5 inch 62-caliber Mk 45 Mod 4 configuration. The Mod 4 is an upgrade to the Mod 2 design, which significantly enhances overall mission performance.     Upon delivery, the two gun systems will be installed on new construction Arleigh Burke Class (DDG 51) Destroyers. The 5 inch Mk 45 Mod 4 includes strengthened gun and mount subsystems, advanced control system enhancements, a modern touch screen user interface and a low maintenance gun shield.     BAE Systems has more than forty (40) years of experience designing and producing Mk 45 gun systems, with more than 250 shipboard applications in the U.S.N. and nine other nations.      Deliveries on these contracts will start in 2014 with the work performed in Louisville, (Kentucky). and Minneapolis, (Minnesota).,