When folks from media outlets try to make the argument that AR's are not for hunting, they are really showing their ignorance. I know the OP originally asked about 5.56, but the AR really isn't a 5.56 rifle any more. It can be any caliber that you want with a change of the upper. Due to this, it's actually one of the best hunting rifles out there. Anything from varmints large game with a caliber change. Maybe that is the angle from which to approach that discussion. They try to frame the argument with the caliber type, but that's a flawed premise from the start.