A chain gun is a type of automatic firearm that uses a rotating barrel system to fire projectiles. Unlike traditional machine guns, which rely on gas or recoil to cycle the action, chain guns use an electric motor to rotate the barrels and feed ammunition. This design allows for a high rate of fire and improved reliability, making them suitable for military applications. Chain guns are often mounted on vehicles, aircraft, or naval vessels, providing powerful support in combat situations. They are commonly chambered for larger calibers, such as 20mm or 30mm, and are used in various roles, including air defense and ground support.