ATK Bushmaster Chainguns Posted April 10, 2015 in Guns & Gear, NFA / Suppressors / Class III by Nicholas C with 24 CommentsTags: ATK, bushmaster, chain guns, medium caliber It’s GLORIOUS. So much destruction. When you need your target to be destroyed into a puddle right now. Here is a video ATK made of their medium caliber chainguns.