This guy isn't the greatest example because he was passed out at the wheel but he was charged with possession of a prohibited weapon for a knife he bought at Walmart and wasn't even full automatic. I stumbled across it a while back when I was looking into an auto knife

https://www.ydr.com/story/news/watchdog/2017/06/29/prohibited-offensive-weapons-law-in-pennsylvania-puts-people-at-risk-of-criminal-prosecution/427791001/