I have one built for Limited but I have seen race guns and SSS has made a red dot sight mount for them also. I shoot major but a race gun in 9mm would be fun
If you need some help on getting parts or starting this build let me know I can help out and know the M&P well.
Here is the Limited gun I built. All you would need to do is get the 170mm base pads to hold more rounds along with a SSS sight holder and of course a C-more sight or red dot of choice.
I added the KKM barrel,
SSS Tugsten guide rod,
SSS magwell,
SSS extractor
Taylor Freelance Base Pads,
High power mag springs,
Lightening on the slide.
Stippled Grip and finger points along with trigger.
Duracoated the slide.
Green Fiber optic front sight,
Burwell Rear Sight,
Trigger Job and Apex comp spring set.
I was at a USPSA match and one guy in our squad was shooting a 9 major open gun. After the chrono stage I stayed clear of him when he shot! I didn't know you get a 9mm bullet to go that fast!
Glock Jockey (SJC Guns) is actually in the process of cooking one of these up as well. You can check it out at the url and follow their progress via facebook.