Happen to have an rpd receiver lying around???Which sadly means nothing will be done. That's a "civil matter" as they'd put it.
It would be, if there was one for sale for that price. A&S has a Tenko adapter for the M10 which allows you to use any AR upper. So a shrike upper could be used.
I've got a RPD parts kit laying around I'm tempted to use for a one off upper for a mac, but take some different routes than the previously banned uppers.