Let's say this ill-conceived affront to liberty passes. Let's say that you then don't ever buy or sell another gun. Then let's say that you get pulled over by a zealous representative of the state and you have your revolver on your seat, in compliance with your local ordinance. Let's further say you bought this gun in a perfectly legal face-to-face sale from a stranger in 2012, and have no paperwork to show that. Who's to say that you didn't purchase that revo from "someone" this morning and didn't run a background check on it?