Never sounded like a bump stock huh? How does it sound different than a full auto AR?
Personally I think there was a good chance the guy was demon possessed ... but entirely possible it was a gubmint coverup too for something else.
All I know is, I don't think I would have wanted to be one of the first officers entering that room, not knowing what's waiting.
I always thought it almost sounded like something belt-fed but I just listened to the sound on your vid w the bumpfire/drum combo and you may be right. Did he have drums though? All I saw were a few Surefire 60s. And... why so many guns? I can see needing a few because you would eventually be melting things but that room was FILLED with ARs?