"Gun Show Loophole": Yet another term to confuse the non-gun owning public. Like rules are different at a gun show than they are anywhere else. They're not. You're a dealer, you have to follow the same rules (background check etc) that apply if you sell from your shop or over the internet. You're a private seller, it's no different than if you sell a gun face to face at your home, in a parking lot, wherever. Assuming, in both cases, all state laws are followed.