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Joel, this will fit no issue on the S&W M&P 2.0 4" barrel 9mm 4 inch barrel Sir. Cheers and stay safe!

Joel, correct, this will fit your S&W M&P 2.0 w/4" barrel. Have a great day!

Joel, it sure will. This will fit and function just fine on a S&W M&P 2.0 with a 4 inch barrel. Hope this helps.