[grobdriver]

a Federal Firearm Licensee can refuse to sell a firearm to an individual for any reason

Source on that?

[Yo-Yo]

Really? It's the FFL's butt on the line if a sale turns out to be illegal, so they have full discretion as to whether they complete a transaction or not.

https://www.atf.gov/firearms/docs/newsletter/federal-firearms-licensees-newsletter-november-2009/download

https://www.usnews.com/news/articles/2016-06-17/dealers-choice-gun-store-owners-can-deny-anyone-they-want