The model MF23013 Glock G23 .40 S&W 13RD replacement magazine is manufactured to exacting Glock specifications. This magazines will sit flush in a Glock 23 and will also work in the 30, 30SF and 30S, but will extend from the magazine well. The Glock G23 .40 S&W 13RD replacement magazine has hardened steel insert encased in high-tech polymer features a round count indicator. This original drop-free magazine for your Glock with standard factory baseplate also features a polymer coating that prevents deformation. This high-quality Glock G23 .40 S&W 13RD replacement magazine with Double-Row Staggered Cartridge Configuration is extremely reliable and provides superior firepower.