I am a long time S&W revolver fan who has recently discovered the M&P semi-autos. Currently have a 45c, 40c, 22c and two full size 40s. The 40c grip is just a bit short and the full size 40 grip is a bit long for concealed carry. I would really like to see a 40 with the full length barrel and a grip the size of the 45c. I could live with the reduced mag capacity from 15 to 12 or 13. Of course, a mid-size 9mm would be OK also.

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Keep Shootin' and check 6

So that's the joy of S&W revolvers isn't it?
You can change out the grip size, shape and material to anything your heart desires.
M&P's, not so much. I understand your want but the reality is that it would be like splitting hairs for S&W. There just wouldn't be enough market for such a small change (that would drive BIG production /support needs/costs)

That said, My 9c has long since been retired in favor of the 45c. I do think the M&P45c is sized (caliber and size) perfectly for carry when (in rare cases) a Snubbie may not be enough.

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Dave