AK’s aren’t illegal..unless they are fully automatic, and he did not specify. He also didn’t say exactly what modification was made to the AR that was “illegal”. Was the barrel sawed off? Was a suppressor (aka silencer) added? Was it just an “Obama Sucks” bumper sticker put on the stock? Oh wait...that might not be illegal yet.
Those are not necessarily illegal either. But they do require Federal Class 3 license.