Heavy Gatling Gun
A really big Gatling Gun with a few critical differences:
In a target rich environment, the HGG has a tendency to damage and/or destroy the engine and working machinery (chassis) of your enemy no matter where you hit it. As such, you might want to use this weapon sparingly if you intend on looting the cars of your defeated foes. If you are not into looting because of a fat wallet and like to see "red-dead" opponents, the HGG, used in conjunction with another gang killer like the Car Rifle, will rid you of targets in a hurry.