There is no "gun show" loophole. I bought a AR10 at a gun show recently and they did a background check. You are talking about transactions taking place between individuals and calling it the "gun show loophole".
If you are against private individuals being able to transfer firearms without a background check say that. I'm against that too, I think we need a background check on every transfer so criminals don't get guns. But it doesn't have a thing to do with gun shows.