MG 131 machine gun
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The MG 131 was a German 13 mm caliber machine gun developed in 1938 by Rheinmetall-Borsig and produced from 1940 to 1945. The MG 131 was designed for use at fixed, flexible or turreted, single or twin mountings in Luftwaffe aircraft during World War II. It was also license-built in Japan for the Imperial Japanese Navy as Type 2 machine gun.
Maschinengewehr 131
13 mm MG 131 and 20 mm MG 151/20 ammunition
Gun turret
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A gun turret is a mounting platform from which weapons can be fired that affords protection, visibility and ability to turn and aim. A modern gun turret is generally a rotatable weapon mount that houses the crew or mechanism of a projectile-firing weapon and at the same time lets the weapon be aimed and fired in some degree of azimuth and elevation.
A modern naval gun turret (A French 100 mm naval gun on the Maillé-Brézé pictured) allows firing of the cannons via remote control. Loading of ammunition is also often done by automatic mechanisms.
The commander's cupola of a Conqueror tank with a machine gun
BEP vignette In the Turret (engraved before 1863).
HMS Captain was one of the first ocean-going turret ships