I don't remember if it was connected to the ban or not but I remember a lot of F.F.L. holders letting their license go because of increased scrutiny by Uncle Sam. People who had their license so they could collect guns easier didn't want to give away the rights they were asked to give up.

I wish I knew the details better. It's been a while ago. But I do remember friends who had their F.F.L. for many years letting it go about that time.