Plenty of FFL's either don't know the rules, or just make them up as they go.
You've got that right! I have found that some of them(FFL holders) will tell a potential seller anything
in order to avoid losing a fee even though they are not needed in the deal. I lost out on a couple of C&R eligible guns last year because the seller refused to ship them to me with my C&R license even though it was perfectly legal because a dealer told him otherwise. This dealer wanted $100 per gun to ship them to me and at that point I told him to stuff it.