I wouldn't say that's pro-gun either. Someone who is pro-gun takes the time to understand that these sort of things don't work.
Background checks aren't bad in and of themselves, but it's "in the system." While I've done my buying through FFLs, I think people should have a right to keep things off the books altogether. The promise that they will not be logged or registered is only as good as those making it. While McCain might not abuse a mandatory background check system, what if Hillary is up in 2012? You don't think she would leverage such an architecture to create a registration system? And you don't think a registration system could eventually result in widespread seizure?
Though the ratio is undiscernible, trigger locks certainly cause some problems, and may cost life, the same as unlocked guns. The difference being that responsible citizens can be harmed by locks, which would be required to protect the irresponsible ones. Basically reverse-natural-selection, opting to save the dumbest at the cost of the wiser.
No, McCain isn't anti-gun in the way Hillary or Obama is. And he's a damn sight better than Romney. But that doesn't make him pro-gun. I'll vote for him, certainly, but we needn't tout illusions of his perfection.