NICS should be mandatory for private face to face sales. It is a loophole like it or not.
Obeying the law as it exists is NOT a "loophole".
People who think the law should cover areas it does not cover say those areas are a "loophole", but they aren't. They get upset at people obeying the law as written, when the people they should be peeved at are they people who passed a law they think didn't go far enough. "Loophole" is a distraction tactic, a "red herring", to get people to think someone is doing something nefarious when in fact they are just simply obeying the law.
NICS mandatory for private sales? In principle, I object to that, not the check part, the mandatory part. I've got nothing against the check, IF the NICS system were available to everyone, and free. It's not.
My state passed a law requiring a background check for all private transfers. Under that horribly written law (which is a separate issue) we are required to take ourselves, the person we want to transfer the gun to, and the gun, to an FFL dealer, and pay them to run the check.
My biggest problem is that the law removes my right to use my own judgement. If someone I'd never met and knew nothing about was looking to buy my gun, then yes, I want a check done (and I'd require him to pay for it) but the law also requires me to have the check done if I want to sell a gun to a friend I've known for over 20 years, who has held high level government security clearances, and who has more guns than I do. Yet under the law, Both of us and the gun have to go to an FFL (during business hours) and pay the fee ($35 in this case).
I don't get the choice. I don't think that's right.