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The 3"/50 caliber gun (spoken "three-inch fifty-caliber") in United States naval gun terminology indicates the gun fired a projectile 3 inches (76 mm) in diameter, and the barrel was 50 calibers long (barrel length is 3 in × 50 = 150 in or 3.8 m). Different guns (identified by Mark numbers) of this caliber were used by the U.S. Navy and U.S. Coast Guard from 1900 through to 1990 on a variety of combatant and transport ship classes.
|3-inch/50 caliber gun (Mk 22)|
|Place of origin||United States|
|In service||1900–1990 (US Navy)|
|Used by||US Navy|
|Variants||Marks 2, 3, 5, 6, 8, 10, 17, 18, 19, 20, 21, and 22|
|Shell||complete round: 24 lb (11 kg); projectile weight: 13 lb (5.9 kg) projectile types: AP, AA (with VT proximity fuze), HE, Illumination|
|Caliber||3-inch (76 mm)|
|Rate of fire||
|Muzzle velocity||2,700 ft/s (820 m/s)|
|Maximum firing range||
|Sights||Peep-site and Optical telescope|
The gun is still in use with the Spanish Navy on Serviola-class patrol boats.