Your numbers for the 9mm capacity are off by one: it should be 7 and 8 for these. It's the super small vs small choice that's being given another option.... For deeper concealment the super small Shield may "fit" better. I don't think one will replace the other, just another choice in the M&P line-up which I think is good. I plan on buying a Shield for backup and maybe deeper concealment, when needed.

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Tom
"Panem et Circenses"