You see this from time to time on Gunbroker offerings. I suspect half the time it is a combination of ignorance and an over abundance of caution and the other half it's an ffl feeling that a brother ffl is getting screwed out of a fee. The really, really stupid one is the ffl who doesn't want to accept delivery from a non-ffl. Irritating but they can do it any way they choose and I choose not to deal with them.