Water-Cooled .50s: The US Navy Mk22 Pedestal Mount
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In 1942, the US Navy adopted the Mk22 Pedestal mount, which fitted a pair of water-cooled Browning M2 machine guns (one left-hand feed and one right-hand). It was used for antiaircraft use primarily, and was also adopted by the Army as the M46 in 1943. The mount was an update to the previous single-gun MK21.
The gunner was protected by a 3/8” (9.5mm) hardened steel shield, and the mount could rotate a full 360 degrees, with elevation from -10 degrees to 80 degrees. They were produced by the Heintz Manufacturing company (no relation to the Heinz company that makes ketchup) of Pittsburgh from 1942 until 1945.
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