ProMag Pistol Magazine Glock 22/23/27 .40 S&W 25 Round Black 1 Pack DuPont Zytel Polymer 25RD. 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 22/23/27 .40 S&W 25 Round Pistol Magazine: Manufacturer: ProMag Gun Make: Glock Gun Model: Glock 22 Glock 27 Glock 23 Caliber: .40 S&W Magazine Capacity: 25 Round Color: Black Fabric/Material: Polymer Package Contents: ProMag Glock 22/23/27 .40 S&W 25 Round Pistol Magazine What firearm models does the manufacturer say ProMag Glock 22/23/27 .40 S&W 25 Round Pistol Magazine is compatible with? The manufacturer suggests that ProMag Glock 22/23/27 .40 S&W 25 Round Pistol Magazine is compatible with Glock 23 Glock 27 Glock 22ProMag GLKA13-25RD: Pistol Magazine Glock 22/23/27 .40 S&W 25 Round Black 1 Pack DuPont Zytel Polymer