He would be wise to review what happened in post-Katrina NOLA. Door to door confiscations started, but came to an abrupt halt. It wasn’t the civilians fighting back, it was - near as any outsider can tell - back rooms of LEO offices saying “stand down or bad things will commence”.
I was walking around my neighborhood with my AR & my 45 on my hip while cruisers were driving around & not once did they imply anything that I was doing was out of line.