What's scary is that slowly, step by step, we are moving toward an Orwellian state of Big Brother watching everything we do.
This BB Gun registering proposal is the same ---That which is odiferous and causeth plants to grow--- non-logic used by the anti-gun nuts. With hundreds of thousands of air rifles in existence in the US, do you really think the guy with the brand-new registered BB gun is the one shooting out windows? Of course not - it's the guy who stole one out of somebody's house.
The problem is - the cops and judicial system aren't out trying to find those guys and punish them for breaking the law - they want to come harass the law-abiding guy with the registered gun because he's an easy target.
More laws are not the answer - enforcement of the current laws would be a good start.