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Yes, this model comes with the picatinny mount so this will fit and function just fine on a M&P sport 2. Hope this helps and you're welcome.

Cecil, yes it comes with a picatinny rail mount, will fit just fine. Have a great day!

Cecil, yes Sir. The included Picatinny Mount will fit your Smith&Wesson M&P Sport II CA compliant model with "ZERO" issue. Cheers and stay safe!

Yes, but the FastFire 3 is a better pistol optic than a rifle. I'd get something with a bigger window.