You know, they might be able to find out who owns a significant number of the guns out there, but taking them is quite another matter. There are some 380 million guns out there, owned by over 100 million people spread out over an entire continent. There are literally not enough police and federal LEOs to keep track of them, let alone seize them - and that is WITHOUT opposition, which there will certainly be.
IOW, things aren’t quite so simple...and I believe that the gun-grabbers are well aware of that - because if they weren’t, they’d have already tried confiscation. It is simple, raw FEAR (fear of not only that percentage of the 100+ million gun owners who would resist, but the vets and former special operators among them that would be FAR more capable and effective) that prevents them from doing so - as the Founders intended.
Oh. I totally agree that it wouldn’t be easy, or even doable...my point simply is it isnt as hard to find out who has them as some might think. Just imagine “rewards” for people “seeing something, saying something”. Just imagine how easy it is to follow social media, forums, etc., and ascertain who has them. It’s amazing the amount of information that people “share” in this method.