ProMag Glock 23/27 Pistol Magazine .40 S&W 13 Round Black 1 Pack DuPont Zytel Polymer 13RD. It is constructed of DuPont Zytel polymer with full length steel internal insert injection molded mag follower and mag spring formed from chrome silicone wire. Specifications for ProMag Glock 23/27 .40 S&W 13 Round Pistol Magazine: Manufacturer: ProMag Gun Make: Glock Gun Model: Glock 23 Caliber: .40 S&W Magazine Capacity: 13 Round Color: Black Fabric/Material: Polymer Package Contents: ProMag Glock 23/27 .40 S&W 13 Round Pistol Magazine The ProMag GLKA11 G23 40 S&W 13 Rd Black Finish is a quality addition to the ProMag lineup. For more great deals on Pistol Magazines by ProMag please browse our Pro Mag Magazines page. What firearm models does the manufacturer say ProMag Glock 23/27 .40 S&W 13 Round Pistol Magazine is compatible with? The manufacturer suggests that ProMag Glock 23/27 .40 S&W 13 Round Pistol Magazine is compatible with Glock 23ProMag GLK-A11-13RD: Glock 23/27 Pistol Magazine .40 S&W 13 Round Black 1 Pack DuPont Zytel Polymer