you do realize that to "own a minigun", you have to file for a class III license and your house is then free game for ATF and government agencies to search any time 24 hours a day. No warrant is needed, and no notice needs to be given ahead of time.
If you're wondering whether or not the ATF ever does inspections at odd hours, they did so to a dealer near where I grew up, showing up at his house and his store overnight because they suspected he wasn't keeping documentation properly. That turned out to be the case - the dealer wasn't keeping older records (he thought the rules were a pain for things that were no longer relevant) and he was shut down.
Translation - who actually owns a minigun? I'd bet you could actually find a list of names - you'd have to be extremely wealthy, and everyone on vacation in your area who watched terminator movies would say "can I come over and try it?!?".
I did know exactly one person who had automatic rifles and a class III without being a dealer - actually, my dad knew the guy. I never met him. The back story was that he married a wealthy lady who inherited a bunch of money and spent her money on machine guns and mcintosh audio equipment.
There was one loophole here that I didn't like, and that was that the "bump stock" was interpreted under the obama administration to be a legal firearm and not an automatic rifle because the gun itself didn't repeat, but the movement of the shooter's hand (influenced by a trick stock) did. I thought it should be class III and the interpretation by the ATF was to the letter of the law and not the spirit.
Trump got in office, declared it a machine gun and had it moved to class III. As a matter of how hopeless politics can make people (or how irrational), there was almost no backlash to Trump more or less overruling agencies and demanding something because he felt "it's a machine gun". It'd have been an enormous pain if it occurred under Obama.
Bump stock is what the las vegas shooter used. I could not understand why Obama didn't make a stink when the ATF ruled it wasn't functionally a machine gun part and was happy to see Trump have it moved to restricted status.