What if they passed national legislation which required you to fill out a form listing all the firearms you owned and you had to submit that to a police agency. A background check would be required. If you pass the check you can keep the weapons and use them in the manner you are using them now. Any weapon that you possess that is not declared to the authorities would make you subject to severe monetary if not criminal penalties. In other words, an undeclared weapon if found in your possession could cost you alot of money, the confiscation of all your guns and maybe jail time. The question-- would you comply with the law?