Ok, Colt's new gatling gun SEE HERE is awesome, but with Dillon it has already been brought'd (I know, really bad movie reference).

It is not exactly new but defines awesome. If you are unfamiliar check youtube for videos.

Available for your armored car, Suburban, watch tower, or turret -- perfect for zombies, aliens, and just about anything else -- the almighty Dillon Aero mini-gun..

From http://www.itstactical.com/centcom/news/shot-show-2012-day-4-live-coverage/#more-11727