I don't want to get gnu spitting blood again - but as I read it Ron's suggestion wasn't to go round taking the guns off people, it was to require them to turn up to drill and training sessions, so as to be available for the old well regulated militia as required.

So if people didn't turn up it would mean either they didn't have guns, or they were falling down on their civil obligations. I can't see any particular problem in ascertaining which of that was the case.

I suppose there would be those who swore they didn't have the guns, or hid them if someone went round to check. But it'd be a drag having to be a covert gun owner if you enjoyed your guns, and if it turned out you'd been lying that would presumably have consequences. It would be simpler to turn up to Militia Training, and probably fun as well.

It might well be useful to have big Militia with millions of members. Maybe they could do othe useful things on the side. A sort of peacetime Home Guard, like Dad's Army.

Since, as gnu sad, you aren't going to be able to disarm your population, why not make sure that gun ownership has sme useful side effects for your country?