Well ... for one thing, there is no oversight. Is that like ... if you're on a "List", you don't know and you can't find out, and you can't get your name off the "List"?
N.J. already using U.S. watch lists to screen gun buyers - The CT MirrorThe CT Mirror:
The New Jersey State Police said Friday they have used the U.S. government’s terrorist watch lists to screen gun permits and purchases for two years under a law signed by Gov. Chris Christie, providing a model for how Connecticut might access the same data. “It is in effect in New Jersey,” said Capt. Stephen Jones, a spokesman for the department. “New Jersey is the first state to use that as a disqualifier for the ability to purchase firearms, and it has been that way since the time of that signing. We do use that currently. We do have access to that data.”(Emphasis Added)