How would the “state” possibly know if I dad any guns? which of course I don’t...
Even if I did when I was a younger man, that doesn’t mean that I do now.
Many states already have registration. Here in CA all sales (save some curio long guns) have to be thru a dealer. If you're buying a handgun, it will be registered. As of Jan 2014, all long guns will be registered too. I have handguns that aren't registered as I bought them before the registration law.