Chain gun
FIREARM MECHANISM THAT USES AN EXTERNAL SOURCE OF POWER TO CYCLE THE FIREARM
Chaingun; Chain powered weapon; Chainguns; Chain-gun
A chain gun is a type of autocannon or machine gun that uses an external source of power to cycle the weapon's action, rather than diverting excess energy from the cartridges' propellant as in a typical automatic firearm, and does so via a continuous loop of chain drive similar to that used on a motorcycle or bicycle.