> “What will they do?”
Sorry. I missed that interpretation.
To answer the above question, though: Break down the door, trash the house, kill the dog, etc. If they find any guns or ammo, you will be jailed for having an illegal arsenal. Even if that is untrue, it will financially break you to prove it. It costs them nothing. They have lawyers on staff to handle these things.
One of the problems I have been thinking about is that even if I get what I think are all my guns and ammo out of the house, there will probably still be some hidden in some out-of-the-way place that I have forgotten about. I have run across stuff I forgot about several times in recent years. That would be to them like catnip to a cat.
That might work a few dozen or hundred times. But then they will have declared war on freedom, and the politicians supporting those orders will have huge "RULE 308" signs branded on their faces. Nobody outside a handful (potus, cabinet) can live inside a moving 500 yard security perimeter.
And don't discount the number of freedom fighters working inside the machine to sabotage the Nazi orders. They will be sending messages of warning from inside HQ, and convoys of swatgoons will suddenly find themselves under attack, or their homes on fire.
This is not Iraq or Afghanistan, where the warfighters live on secure FOBs inside rings of razor wire.