16-inch/50-caliber Mark 7 gun

16"/50 caliber Mark 7 gun
The Iowa-class battleship USS Iowa fires a full broadside of her 16"/50 (406 mm) Mark 7 guns.
Type	Naval gun
Place of origin	United States
Service history
In service	1943–1992
Used by	U.S. Navy
Wars	World War II Korean War Vietnam War Lebanese Civil War Gulf War
Production history
Designed	1939
Specifications
Mass	267,904 lb (121,519 kg; 121.519 t) (including breech)
Length	816 in (68.0 ft; 20.7 m)
Barrel length	800 in (67 ft; 20 m) (50 calibers)
Shell	AP Mark 8: 2,700 lb (1,225 kg) HC Mark 13: 1,900 lb (862 kg) Nuclear Mark 23 (W23): 1,900 lb (862 kg)
Caliber	16 in (406 mm)
Muzzle velocity	AP: 2,500 ft/s (762 m/s) HC & Nuclear: 2,690 ft/s (820 m/s)
Maximum firing range	29 mi (47 km), (23.64 mi (38.04 km) accurately)

The 16"/50 caliber Mark 7 – United States Naval Gun is the main armament of the Iowa-class battleships and was the planned main armament of the cancelled Montana-class battleship.