Just looked at my M+P .40, Mine came with factory Novak fixed sights, but the set screw (rear), looks like a "weird" type of Allan screw on the rear. Metric and standard Allan's won't fit mine.
It may just be the "magic" tool, I have called S&W and not been disappointed with "tech support" , but not for sights,. just an option before trying it yourself or "smithing it"
I enjoy my factory sights, but if you find out anything regarding Trijicon installs, please give me a heads up for the M+P.
Thanks,
Tom W.