3-inch/50-caliber gun
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The 3-inch/50-caliber gun in United States naval gun terminology indicates the gun fired a projectile 3 inches in diameter, and the barrel was 50 calibers long. Different guns of this caliber were use
Mark 22 3"/50 cal gun
An early 3"/50 on USS Rambler (SP-211), 1918.
USS Pivot firing its forward 3"/50-caliber gun.
3"/50-caliber gun aboard USS Slater.
The 3"/70 Mark 26 Gun was a US post war naval anti-aircraft gun. Developed as a joint project with the United Kingdom, which called it the QF 3-inch Mark N1 gun, it had a water-cooled barrel combined
3-inch/50-caliber gun
…and Modernization (FRAM) program of the 1960s had their 3-inch (76 mm) guns removed. Experimentation with an extended range variant the fully automatic 3"/70 Mark 26 gun was abandoned as shipboard surface-to-air missiles were developed. The United States Navy considered contemporary 5-inch/38-caliber guns and 5-inch/54-caliber…
3"/70 turret on USS Carpenter in 1962