Side Note: Full auto weapons were banned in 1934 but an Amnesty day was held as late as 1968
If it ever does get to the point of authorities going door to door it has been speculated and wondered if cops, military etc will go against the constitution and citizens and if they would refuse to uphold the law. I know a lot of cops and most are really good people and on our side. I think personnel assigned to go door to door (or whatever method they use) would not disobey an order directly. I think more than likely what would happen is an officer of some kind would show up at your door with a clipboard with your address on a list and say something like......"Sorry to bother you Mr Duke Sir but we have been assigned this
It would be a daunting task to do this and I dare say not very pleasant and they would most likely not want a confrontation, I mean how would you like to be poor slob assigned to go into the rural back woods and mountains, miles from anywhere and do this. Some would never be seen again.
My personal opinion is this would be such a major headache and impossible task and cause such an underground economy that they would have NO control over it would end up like prohibition and be repealed.....But what do I know, the war on drugs has been successful so far and is fully under control.