[LewSchiller]

I dunno.
At gun shows you and your buyer go to an FFL who runs a check on the buyer. You give the gun to the FFL - then he runs the check. He holds it until the check is complete. If pass then the buyer pays you. You - or the buyer - pay the FFL for the BGC and the deal is done.
I've never been involved in one wherein the buyer fails - but I'm sure its happened. Prior to July 1st I presume the FFL would just return the firearm to you as seller. Now it's entirely possible they'd have to run a BGC on you first.

If you pawn a firearm they have to run a BGC before returning it to you. If you pawned a firearm with a magazine in excess of 15 rounds - as I understand it now - they can't return that magazine to you as they have taken possession of the firearm for the duration of the pawn. There is a "continuous possession" provision in the law.