They didn't change the shotgun, that's what it looks like when you have a really bad connection and you're running with shotguns. You can really see it on your first kill when you shoot, get the hit marker, and then it takes the better part of a second for the points to show up and the guy to fall. If you had watched the kill cams you would have seen that most of the time it wouldn't have shown you taking a shot at all.