Don't mean to bust your bubble but this has been going around for a while. It was a bill introduced in 2000 that never even had a chance of being passed, even the guy who wrote it back then new it was a long shot. Dates and words have been changed recently to get gun owners scared. I just want to make sure no one gets worried or mad about this when its something that the anti's reworded and butchered up to get gun owners in a frenzy. Here's the Snopes on it:
http://www.snopes.com/politics/guns/taxreturns.asp