If so, I think this goes way beyound gun control and more to tax evasion.
Why in the heck jeopardise my firearm rights with your illegal tax evasion scheme?
Interesting viewpoint. Use tax laws to control guns. You have a real future ahead of you in the gun control lobby.
A private sale background check, presumably, wouldn't tell anything about who the seller is, only the buyer. And, if it is like current FFL checks, wouldn't tell what kind of gun the buyer bought and it doesn't tell what he paid for it.