Minigun

In other incarnations, known as a Stinger.

Unreal Tournament 2004
''The Schultz-Metzger T23-A 23mm rotary cannon is capable of firing both high-velocity caseless ammunition and cased rounds. With an unloaded weight of only 8 kilograms, the T23 is portable and maneuverable, easily worn across the back when employing the optionalcarrying strap. The T23-A is the rotary cannon of choice for the discerning soldier.''