Hey guys, unfortunately Patriot Defense didn't pan out. The office lady said they could do it but wasn't familiar with the Grand Power line, unfortunately she never sent me a work order. She seemed pretty busy and in a rush on the phone and said she would check if it could be done but never called me back. I called again a month later about something else and got the same answer. I figure if a company doesn't follow up with a potential customer I don't really want to hound them for answers or send an expensive part to.
I put my Shield RMS on a Glock 19 MOS instead and am very happy with it for now.
(Still interested in getting my K100 or X-Cal milled for a Shield RMS, so if anyone else finds someone who will actually do it that would be great. Kind of a bummer that no one will do it! )