I just had a thought...Wolf makes lots of ammo. Including 22LR. Could this warning be directed toward the M&P 15-22 that had problems at the appleseed event some time ago? Maybe the press report didn't include the entire rifle model. M&P 15 oops, I mean 15-22.

Is this the possible reason for this issue, since I seriously doubt the AR version would have problems with any ammo that is mil-spec.