The model MF27009 Glock G27 .40 S&W 9RD replacement magazine is manufactured to exacting Glock specifications. The G27 .40 S&W 9RD replacement magazine with 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 G27 .40 S&W 9RD replacement magazine with Double-Row Staggered Cartridge Configuration is extremely reliable and provides superior firepower.