Not to sure about the 9mm Shield but I can tell you that the 40 Shield will be quite snappy yet manageable. I own 3 40's A full size M&P40 and a compact M&P40 and I picked up my Shield last month after a 5 week wait.
After the same 7 round magazine had two nosedives when I first fired the weapon for its first time to the range and after careful cleaning and dis assembly of the said magazine along with cleaning it as well and over 350 more rounds not a single problem and I trust it as well as all my other M&P's which are several actually all of them they make except for the 22 even the M&P 15 Sport 5.65/223.
You will love your new gun and if you are like me it will be your primary EDC!
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59,M&P9,40,40C,357,(2)45,G26
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