I too am waiting for a 45 FPC. I would have thought it would have been out before the 10MM. I might just go out and get a M&P in 45 to marry it up to the FPC. Can't be that difficult to adapt the FPC to a 45. My wife and son love the 9 I have. I did change the plastic handguard to a Taccom3 handguard. Topped it off with a Odin 9 Atlas compensator. I also switched out the buffer-end plug to see if it really made a difference. The FPC 9 hardly kicks anyway.
