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That is intended for a S&W M&P9 however I have heard the magazines are quite similar to the SR9 pattern for whatever reason and might work. However, you could just try this one meant for the SR9/SR9C: https://www.budsgunshop.com/product_info.php/products_id/18203/promag+rug+sr9+9mm+32rd+blue+steel
Ryan, No this ProMag S&W 9mm knockoff will not fit or function in a Ruger SR9C. This 32 round ProMag magazine will.-------https://www.budsgunshop.com/product_info.php/products_id/18203/promag+rug+sr9+9mm+32rd+blue+steel
Ryan, no Sir. Several owners in both Ruger and S&W Forums have confirmed they are not interchangeable. You would need this magazine for the SR9 : https://www.budsgunshop.com/product_info.php/products_id/18203/promag+rug+sr9+9mm+32rd+blue+steel
No it will not work and I have never had any luck with any Pro Mag magazine and advise avoiding them