The 4.7 inch QF Mark XI gun was introduced as the main armament for the L and M class destroyers. It fired a 62 lb ( 28.12 kg) shell fired at 2538fps (774 m/s) to a maximum range of 21,240 yards (19,420m) at 45 degrees of elevation. The gun was multipurpose giving it the ability to engage both ground and air targets. Aboard the L and M class destroyers, the gun saw active service during World War II. Some L and M class destroyers were sold to the Turkish and Polish Navy’s and saw service after the war. Records show that the gun was still in service as late as 1970.