news outlet also identifies as a S&W "AR" style rifle
(that, and an AK would have taken that guys arm off)
however, you are correct on him not being allowed to legally open carry in the state of wisconsin
i guess the question of legal ownership should be answered in IL where the kid resided
i know here in MI there are laws preventing licensed dealers from selling a long gun to a minor, but those laws do not apply to individuals, and it is perfectly legal to give long guns to minors