An autoloader or auto-loader is a mechanical aid or replacement for the personnel that load ammunition into crew-served weapons without being an integrated part of the gun itself. The term is generally only applied to larger weapons, such as naval weapons, tanks, and artillery; that would otherwise have a dedicated person or persons loading them.
The American Mobile Gun System autoloader holds up to 18 rounds.
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