I've seen the cheek rest for the MOE stock but is there one that is specific to the "standard" stock on the M&P? After multiple rounds down range, I'm starting to get a feel for what I would like to adjust.

I have seen some "snap on" cheek rests that would work on the factory stock. Crracer sent me a link but I cant find it at the moment. I have a large scope mounted on my Sport and have just started seriously thinking about a cheek rest, but by the end of this week I will have some new parts that enable me to get a better mounting situation plus loosing the A2 front sight in favor of a railed gas block. After these changes I will know more about what I am looking for.
I saw a couple in the new CDNN catalog last night.

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Grover Oathkeeper

Just make sure the cheek rest does not block the full stroke of the charging handle when the stock is extended to the position which you normally shoot.

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-John

I know it's expensive, but for an AR I would get this and mount it on a CTR stock.

LaRue Tactical RISR

You can get away with the MOE cheek riser on a 15-22, but for a real AR I don't feel impeding the charging handle is a good idea under any circumstances. This LaRue product is a decent solution.

Dragon is the CTR another MagPul product?

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Grover Oathkeeper

Yes. It's the MOE stock plus a friction lock to eliminate play on the receiver extension. Not a completely necessary upgrade, but I like it.