Autocannons and Chain Guns

Automatic cannon of twenty to thirty millimeters that fire explosive shells in bursts, used on aircraft, ships and armored vehicles, including the Oerlikon 20 mm cannon and the Mk44 Bushmaster II chain gun. A weapon belongs here when its cited article describes it as an autocannon or chain gun. It excludes large-caliber artillery and anti-aircraft guns of heavier caliber. Autocannons fire at high rates and are fed from belts or magazines, and these examples armed aircraft and ships in the Second World War and fighting vehicles and helicopters in recent decades.