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8-inch Mk. VI railway gun
The 8-inch Gun Mk. VI, M3A2, on railway mount M1A1 was a World War II improvement on the World War I-era 8-inch (203 mm) M1888 gun and was used by the US Army's Coast Artillery Corps in US harbor defenses. The guns were also mounted in fixed emplacements on the barbette carriage M1A1. These guns were US Navy surplus from battleships scrapped under the 1922 Washington Naval Treaty. Mark VI (also Mark 6) was the Navy designation and M3A2 was the Army designation for this gun, in sources they are usually written together.
==History==
The MK. VI railway gun was quickly put together at the start of World War II, to supplement the older World War I 8-inch M1888 railway gun. It was developed from an experimental 12-inch (305 mm) railway howitzer carriage of World War I. The all-around rotating mount and outriggers were designed to allow the gun to track a moving target for coast defense. These guns had a very short life in Army use, entering service in February 1941 and being cut up for scrap immediately after the war. The guns were the Navy's 8-inch (203 mm)/45 caliber Mark VI, and were originally secondary armament on ''Virginia''- and ''Connecticut''-class battleships launched 1904-06 and scrapped in the 1920s.〔(【引用サイトリンク】 title=USA 8"/45 (20.3 cm) Mark 6 )〕 They were mounted in both fixed emplacements and on the M1A1 railway carriage.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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