BTW, that is already a problem with the NICS system. There is no easy way to challenge it if you are on the red-flag list. You need to hire a lawyer and sue them if you are mistakenly listed.
Yeah, my Dad had that problem some years ago (6 or 7 maybe) when he was denied purchase of a 9mm in Arizona of all places
The man has had security clearances up the wazoo since the late 60's yet for some reason he was denied.
Anyway, he contacted then Senator Kyle and surprise, surprise, Kyle actually took care of it in an expedient fashion...IIRC it only took a few weeks and it was resolved.
I don't know how it is with other States or Senators but Kyle sure handled it....I wonder if it is different now and if a Senator would even go to bat for a lowly "Citizen these days?