Factory Smith magazines offer the same reliability and durability expected from your M&P9. Smith and Wesson has a long heritage of making reliable handguns. In the summer of 2005 they introduced the M&P series of Handguns. The combined evolution of the Sigma and SW99 made it an instant success. Facotry 17rd M&P9 magazines will fit flush in your M&P9 and stick out in your M&P9c but will fit and function just the same.
Smith and Wesson left the magazines unchanged for use in the new M&P9 M2.0 series. Making these the correct magazine for both series of pistols. So whichever version you have this is the magazine you need.