Only what I've heard, same as you.
Back in the dawn of time, when dinosaurs roamed the earth, I was an agent with the US Border Patrol. One day I went down to my local mom and pop gun shop to pick up a firearm I'd ordered. When they ran the NIC, it came back as being on hold, pending a supervisor's approval. Now the only thing that had changed in my life had been my joining he Border Patrol, so I was, of course, somewhat curious, so I asked.
The shop owner told me that if someone is denied, they never ever say why. In my case, because I was now technically a "fed", my name now was on a separate list and required a NIC supervisor to give approval, and he was at lunch. So I had to wait 2 more hours for some bureaucrat in Morganton, WV to wander their way back from the local burger joint and put in his code to unlock my, "constitutionally protected right", or some facsimile thereof.
As far as having to sue to find out why your were denied or to get your rights back, that's from other peoples personal horror stories.
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