I think they miss the point about registering and tracking. Of course no one wants a crazy person or a felon buying weapons.
Check it out:

Before going to Diamondback Police Supply to try to buy an AR-15 on March 5, Mark Kelly made a video inside his home in which he told his wife Gabby Giffords, “I’m going to the gun store and buy a gun today because I want to demonstrate to everybody who will be watching how easy it is to get a universal background check.” However, the video appears to be edited so as to leave out his request for an AR-15.

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