Genuine Smith & Wesson M&P Pistol Magazines ensure M&P semi-auto pistols function flawlessly under all conditions. S&W mags are constructed from steel, using premium springs and polymer followers for reliable feeding. These are factory replacement parts, manufactured with the same materials and to the same exact specifications and tolerances as original parts, which guarantees excellent fit and reliable operation. Genuine Smith & Wesson magazines Constructed from steel Premium springs Polymer shell followers Manufactured to factory specs