QF 4.7-inch Mk IX & XII naval gun

The 4.7 inch QF Mark IX and Mark XII were British 45-calibre naval guns that armed the majority of Royal Navy and Commonwealth destroyers during the Second World War, in service from 1928 to 1970 and later exported as the ships that carried them were sold abroad, serving with the navies of Canada, Australia, Greece, the Netherlands, Poland, Norway, Turkey, the Dominican Republic, Argentina and Brazil in addition to Britain. Britain produced 742 Mark IX and 372 Mark XII guns, each weighing about 3 long tons, firing a 50 pound armor-piercing or high-explosive shell at a muzzle velocity of 2,650 feet per second, a rate of fire of about 15 rounds per minute, and a maximum range of nearly 17,000 yards at 40 degrees elevation. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/