Are you saying the militias at the time the Constitution was written registered their guns. Doubt it.
They knew everyone who was in their militia and what weapons they had
What we call....well regulated
The People are the Ultimate Militia and, as such, should not begrudge the registration of firearms and the licensing of owners, and standards for vetting and usage-training and storage and transport and carry and sale and transfer and disposal.
None of that detracts from one's right to own them, so long as they meet society's standards for ownership.
It is clear to even the worst dullard that we need to find a way to reduce the number of guns in the hands of criminals and the incompetent or dangerous amongst us.
There is no way other than to set national standards and to employ centralized data management and to enforce them.
Done right, such changes are likely to greatly reduce the number of sources for illegal (un-registered or stolen) firearms and to greatly improve the gun-ownership climate for ordinary citizens, under circumstances where the public-at-large may rest easy that sales, transfers, training, registration, licensure, transport, etc., are all being done right.
Very little difference, in the long run, from registering your vehicle and obtaining a license for it and yourself, and undergoing initial and/or refresher training, and undertaking periodic competency testing, and having all that registered in a centralized database.
If we can do that with our road-vehicles (and airplanes and boats, for that matter), there is no reason why we cannot do the same with firearms, which pose a mortal danger when used improperly or when fallen into the wrong hands.
There are a variety of rights and privileges outlined or implicit or derived from the verbiage in the US Constitution, which are reasonably-well regulated, through registration and licensure and the like.
It's time to stop freaking-out and being paranoid about The Gubmint taking our guns, and acknowledging the sanity and higher degree of safety that such an approach brings.
The Second Amendment - in its current mode of interpretation - should be allowed to stand indefinitely.
The Gun-Grabbers cannot have the guns.
But the Gun-Rights folks need to budge, as well, in order to keep the peace, and to put this matter to rest, once and for all.
And, frankly, that 'budge' is going to consist of a better approach, at the national level, and integrating the work of the States, to register and license firearms and owners.
That's just the way it's going to be.
It's not a question of "IF".
It's merely a question of "WHEN".
Might as well bite-the-bullet and get this over with, rather than spend more years pointlessly burning-up energy, trying to sweep back the sea with a broom.