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  1. 3-inch/50-caliber gun - Wikipedia

    • The 3-inch/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 19… See more

    Place of originUnited States
    In service1900–1990 (US Navy)
    Used byUS Navy
    Early low-angle guns

    The US Navy's first 3 inch /50-caliber gun (Mark 2) was an early model with a projectile velocity of 2,100 feet (640 m) per second. Low-angle (single-purpose/non-anti-aircraft) mountings for this gun had a range of 70… See more

    Dual-purpose guns of the World Wars

    Dual-purpose 3 inch/50-caliber guns (Marks 10, 17, 18, and 20) first entered service in 1915 as a refit to USS Texas (BB-35), and were subsequently mounted on many types of ships as the need for anti-aircraft protection … See more

    Submarine deck guns

    The 3"/50-caliber gun Marks 17 and 18 was first used as a submarine deck gun on R-class submarines launched in 1918–1919. At the time it was an improvement on the earlier 3"/23-caliber gun. After using larger guns on m… See more

     
  1. The 3"/23-caliber cannon was the first purposely designed anti-aircraft cannon to reach operational service in the US military, and was a further development of a 1-pounder cannon concept designed by Admiral Twining to meet the possible threat from airships being built by various navies.
    en.wikipedia.org/wiki/3-inch/23-caliber_gun
    en.wikipedia.org/wiki/3-inch/23-caliber_gun
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  3. USA 3"/50 (7.62 cm) Marks 27, 33 and 34 - NavWeaps

    Mar 25, 2019 · HC Mark 27 and AA Mark 27 were the same projectiles but assembled with different fuzes. These 3" (7.62 cm) HC rounds were unique in that they were the only ones of that type issued by the USN that did not have a …

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  8. 3" 50 Cal Anti-Aircraft Gun - NHHC

    Mar 30, 2020 · 3" 50 Cal. Anti-Aircraft Gun, US, MK 20. One wood and brass model of a 3-inch, 50 caliber anti-aircraft gun mount. Single-gun with a pedestal-type mount, the body is comprised of carved wood with...

  9. 3″/50 Single and Twin Mounts - Tin Can Sailors

    The 3-inch/50-cal. Mark 22 was a semiautomatic gun with a power driven automatic loader that fired a fixed AA (Anti Aircraft) or HC (High Capacity) round consisting of a projectile and a cartridge case crimped to the projectile. The …

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  11. 3-INCH MOUNT MARK 20, 21, 22 AND MODS - Maritime

    Ordnance Pamphlet No. 811 first revision describes 3-inch 50-caliber dual-purpose Gun Mounts Mark 20 Modifications, Mark 21 and Modifications, and Mark 22 and Modifications as of December 1943 as installed on Army, Navy, …

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