@*SD* No, it has not been proven or shown to be wrong.
Sure, I can clean my toilet with a toothbrush, does not change that its meant for brushing my teeth.
And you do realize I am talking about guns in general, not just handguns? You might be able to argue for rifles, maybe even handguns ... what about the other categories, doesnt even have to be the infamous AR-15, how about something cute and small, like a Mac 10?
An AR-15 is usually chambered in 5.56 (.223) which is a common (very) hunting calibre since it's the NATO cartridge.
And yes, you HAVE been shown wrong, if you don't grasp this yet, then it's a you problem, not an everyone else problem.