The chain in a chain-gun refers to the motor drive not a chain that hold the cartridges, it just an auto cannon that has its action being operated a motor drive

The chain in a chain-gun refers to the motor drive not a chain that hold the cartridges, it just an auto cannon that has its action being operated a motor drive basically it’s a very fast repeating rifle. It doesn’t have much to do with how the ammo is loaded. Also most auto cannons today even the high fire rate ones that are used for CIWS and AA aren’t chain guns.