[Meph504]

If you have a collapse, I don't think permits on weapons are going to be a large concern. And after the collapse, they are one of the more simple to craft, and easy to operate weapons.

MadMax should be your go to guide right? (just kidding)

Large targets, can be whittled away over time, you basically become under siege, your attackers can leave anytime in small groups to gather supplies, you would be stuck at your parameter.

Think castles, after a while, they all fall through starvation, contamination, sabotage, etc..