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  1. Wikipedia
    https://en.wikipedia.org/wiki/3-inch/50-caliber_gun

    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

    TypeNaval gun
    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

    3"/50 (7.62 cm) Mark 10, 17, 18, 19, 20, 21 and 22 - NavWeaps
    NavWeaps
    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

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    Early low-angle guns
    Dual-purpose guns of the World Wars
    Submarine deck guns
     
  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.

    3-inch/23-caliber gun - Wikipedia

    en.wikipedia.org/wiki/3-inch/23-caliber_gun
    en.wikipedia.org/wiki/3-inch/23-caliber_gun
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  2. People also ask
    What was a 3 inch anti-aircraft gun?
    The 3-inch anti-aircraft gun M3 was an American anti-aircraft gun which served throughout the 1930s and into early World War II. [ 2]

    3-inch anti-aircraft gun M3 - Wikipedia

    en.wikipedia.org
    What AA guns were used in WW1?
    3"/50 (7.6 2 cm) target practice aboard USS Milwaukee CL-5 in December 1928. Note the safety rails around the guns. U.S. Naval Historical Center Photograph # NH 64614. A series of 3" (7.62 cm) AA guns dating back to World War I. These were of a simpler construction than the previous 3" (7.62 cm) guns and successive marks were to improved designs.

    3"/50 (7.62 cm) Mark 10, 17, 18, 19, 20, 21 and 22 - NavWeaps

    navweaps.com
    What is the caliber of the mk-33 3 inch naval gun?
    Mk-33 3"/50 caliber 3-inch naval gun system HOME|US Navy - ships|US Navy - air units|USMC - air units|International Navies|Weapon Systems|Special Reports Surface Vessel Weapon System Mk-33 3"/50 caliber twin gun Mk-33 3”/50-caliber twin DP gun aboard USS Austin (LPD 4) Technical data: Caliber:3 inch (76 mm)

    Mk-33 3"/50 caliber 3-inch naval gun system

    seaforces.org
    What is a 3 inch 50 caliber gun?
    USS Pivot firing its forward 3"/50-caliber gun. 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 7000 yards at the maximum elevation of 15 degrees.

    3-inch/50-caliber gun - Wikipedia

    en.wikipedia.org
    When did a 3 inch gun become an anti-tank gun?
    In September 1940 a project started to adapt the 3-inch gun to the anti-tank role, starting with the T9 experimental model but equipping it with the breech, recoil system and carriage borrowed from the 105mm M2 howitzer. The gun was accepted for service as the 3-inch M5.

    3-inch anti-aircraft gun M3 - Wikipedia

    en.wikipedia.org
    What type of Mount for a 3 inch gun?
    The assemblies described in this book are dual-purpose pedestal-type single-gun mounts for 3-inch 50-caliber guns. They are open mounts with flange-bolted stand deck emplacement; one design (Mk. 21 and Mod.) is a "wet" type mount for exposed submarine deck emplacement.

    3-INCH MOUNT MARK 20, 21, 22 AND MODS

    maritime.org
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  3. NavWeaps
    http://www.navweaps.com/Weapons/W…

    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 …

  4. NavWeaps
    http://www.navweaps.com/Weapons/WNUS_3-50_mk10-22.php

    3"/50 (7.62 cm) Mark 10, 17, 18, 19, 20, 21 and 22 - NavWeaps

  5. Wikipedia
    https://en.wikipedia.org/wiki/3-inch_anti-aircraft_gun_M3

    3-inch anti-aircraft gun M3 - Wikipedia

  6. Wikipedia
    https://en.wikipedia.org/wiki/3-inch/23-caliber_gun

    3-inch/23-caliber gun - Wikipedia

  7. Images of Navy 3 inch AA Gun

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  8. NavWeaps
    http://www.navweaps.com/Weapons/WNUS_3-50_mk2.php

    USA 3"/50 (7.62 cm) Marks 2, 3, 5, 6 and 8 - NavWeaps

  9. NHHC
    https://www.history.navy.mil/our-collecti…

    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...

  10. Tin Can Sailors
    https://www.destroyers.org/tcs-ships/ord…

    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 …

  11. Seaforces Online
    https://www.seaforces.org/wpnsys/SURFACE/Mk-33-gun.htm

    Mk-33 3"/50 caliber 3-inch naval gun system - Seaforces

  12. San Francisco Maritime National Park Association
    https://maritime.org/doc/threeinch/index.…

    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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