Reread my post. I said it is a National gun OWNERS registery.
If you have the OWNERS, they posses what the want..
To know WHO to go after.
IT IS THE OWNERS THEY WANT.
There are many overlapping data bases to mine for gun owners.
Buy ammo with a credit card? Post on hunting forums? Subscribe to a gun magazine or visit gun or self defense oriented sites on the Internet?
All tracked and in the data base.
If a person buys a gun with a background check, what is to stop them from selling it to someone else?
Or tell the govt they did?