I have some ACT magazines for the 1911 and, I think, Beretta 92, and all have worked fine for me.
Mec-Gar makes the OEM M&P mags for Smith & Wesson (or at least did at one time). ACT is another Italian company, apparently different from Mec-Gar but their mags sure look quite similar to Mec-Gar products. I would expect these to work just fine.
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