We in the Tucson area were warned about this a few years ago at a Tea Party event by a doctor who said this was a question that was aimed at eventual confiscation through Obamacare.
Charles Heller excellent show America Armed and Free is right now discussing guns and registration.
http://www.kvoi.com/live-stream/
If you are interested, this will be made into a podcast to be found here:
http://www.libertywatchradio.com/recent_shows_
Remember, to own a gun is a right, but if you regulate it through the government it changes into a privilege with the politicos making it an increasingly difficult possession to have.
That makes PERFECT SENSE. They need data, and if gun owners are STUPID ENOUGH to give themselves away, they deserve to lose their guns.