Grrr! Sorry, posting from my phone, accidentally hit the button.If an FFL dealer is selling the gun then they have to do the check regardless of where they're selling it. That's true at every gun show in every state in the union. If you aren't an FFL dealer there is no federal law requiring you to conduct a background check. That's true whether you're at a gun show, in a parking lot, in your living room, etc. That does not mean, however, that you can legally sell/give/transfer a gun to just anyone, if they are prohibited from buying/possessing a gun it is illegal to sell/transfer a gun to them, check or no check. So it behooves a seller to be sure the buyer is not prohibited. They can ask an fFL dealer to do the check, but they'll certainly have to pay a fee for this service (whatever the FFL wants to charge, there's no regulation of that fee). Any sales across state boundaries require checks regardless of who does the selling.The vast majority of transfers done without checks are transfers between friends/family members. Grandpa giving his grandson his first rifle, family heirlooms being passed down after the owner passes, etc. When there is a call for "universal" checks it is predominantly these transfers that will be affected. That's the objection.