I'm not going to say that you'll never find a pre-milled M&P 40 slide somewhere, since there could be production overrun, but it's rather unlikely.
The most realistic way to mount an optic on your pistol is going to be sending your slide to be milled, or buying a slide from eBay, Numrich Gun Parts, or elsewhere, and having it milled. M&P 2.0s in 40 S&W are down to batch production, and the lack of availability of new pistols suggests that they haven't made a batch in a while.
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