The Smith & Wesson M&P Shield Plus Equalizer 9mm 15-Round magazine is compatible with both the Smith & Wesson M&P Shield Plus and the all-new Smith & Wesson Equalizer pistol. The 15 round magazine gives the user an increase of capacity over the 13 round magazines while keeping a relatively small footprint. The magazine features a proprietary single-to-double-stack design with a precision-machined steel body that comes equipped with an extended polymer floor plate with a durable polymer extension for improved stability. The corrosion-resistant black finish offers enhanced reliability and consistent operation giving the user confidence that the magazine will work in all conditions.