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A chain gun is a type of machine gun or autocannon that uses a chain drive (hence the name) to operate the reciprocating bolt driven by an external source of power in order to cycle.

Examples

• L94A1
• AAI In-Line
• Bangerter machine gun
• Profense PF 50
• Northrop Grumman Sky Viper
• M242 Bushmaster
• Mk44 Bushmaster II
• M230
• Bushmaster III
• Bushmaster IV
• XM813 Bushmaster II
• XM913 Bushmaster III

Other uses of the term

• The term has been used to describe firearms using a linkless conveyor feed, or in some cases a chain of linked chambers, similar to that of a Belt.
• The most common misnomer of the term has been used to describe multiple-barrel rotary guns such as the Gatling.