Idk if it's possible, but I don't think it would be very practical, as it is RMR barely fits onto full sized slides, on a shield it would not only look awkward, but it would throw the balance of the gun off and I suspect may slow slide velocity enough to cause a malfunction. I'd pass.
If you want an M&P with an RMR, may I suggest waiting for one of the CORE models to hit shelves. That is what I'm planning to do.
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