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The Mark 7 gun was a built-up gun and was constructed of liner, tube, jacket, three hoops, two locking rings, tube and liner locking ring, yoke ring and screw box liner. Some components were autofretted. Typical of United States naval weapons built in the 1940s, the bore was chromium-plated for longer barrel life.
In August 1991, Sandia and the GAO completed their reports, concluding that it was likely that the explosion was caused by an accidental overram of powder bags into the breech of the 16-inch gun. The U.S. Navy, however, disagreed with Sandia's opinion and concluded that the cause of the explosion could not be determined.
The Gun Assembly shown in the picture is the mount's right gun. The left gun is the mirror image of the right gun. Since this gun assembly fired semi-fixed ammunition, (pictured) each round was delivered to the guns in two pieces. [27] Each gun, in this twin mount, had its own projectile hoist and powder case hoist from the upper handling room.
The U.S. Navy had the 16"/50-caliber Mark 2 guns left over from the canceled Lexington-class battlecruisers and South Dakota-class battleships of the early 1920s. However it was already apparent that the Mark 2 was too heavy to arm the North Carolina and new South Dakota (1939) battleship classes which had to adhere to the 35,000 ton standard displacement set by the Second London Naval Treaty.
English: DN-SC-91-03644 - The gun captain of the center Mark 7 16-inch/50-caliber gun in the No. 2 turret aboard the battleship USS IOWA (BB-61) gives the signal to ram the powder bags on the spanning tray into the gun's chamber. The crew is loading what will be the 1,000th round fired by the IOWAs 16-inch guns since the ship's recommissioning.
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One unique naval gun was the long nine. It was a proportionately longer-barrelled 9-pounder (4.2 in (110 mm)). It was typically mounted as a bow or stern chaser where it was not perpendicular to the keel, and this also allowed room to operate this longer weapon. In a chase situation, the gun's greater range came into play.
The 46 cm (18.1 in) 46 cm/45 Type 94 naval rifle was a wire-wound gun.Mounted in three 3-gun turrets (nine per ship), they served as the main armament of the two Yamato-class battleships that were in service with the Imperial Japanese Navy during World War II.