I have no exp. with the M&P 9 but do have one in .40. I also have a G19 (gen 3) and have to say that they both have their problems. The smith had mag problems while shooting it dropped mags without hitting the release and the G19 throws brass back in my face so I would guess extractor/ejector problem. Long story short, buy the one that feels the best to you and understand that any/all firearms have potential issues.
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