"But there's a lot of high-fives when you shoot something down with a gun, kind of World War II-style." The MK-45 is a five-inch artillery gun mounted to the deck of a warship. It is one of many ...

Service: USN Armament: Standard Missile (SM-2MR); Vertical Launch ASROC missiles; Tomahawk; 6x MK-46 torpedoes; Close In Weapon System; 5-inch Mk45 Gun ... and increase war fighting capabilities ...

Various guns were used, until a true dueling pistol was officially standardized in 1777, as "a 9 or 10 inch barreled ... 1854-56 - The Crimean War. The last war to use only muzzle-loaded guns.