ProMag Pistol Magazine GSG-5 .22 LR 22 Round Black 1 Pack DuPont Zytel Polymer 22RD. It is constructed of DuPont Zytel polymer with injection molded mag follower and mag spring formed from chrome silicone wire. Specifications for ProMag GSG-5 .22 LR 22 Round Pistol Magazine: Manufacturer: ProMag Gun Model: ATI GSG 5 Caliber: .22 Long Rifle Magazine Capacity: 22 Round Color: Black Fabric/Material: Polymer Package Contents: ProMag GSG-5 .22 LR 22 Round Pistol Magazine What firearm models does the manufacturer say ProMag GSG-5 .22 LR 22 Round Pistol Magazine is compatible with? The manufacturer suggests that ProMag GSG-5 .22 LR 22 Round Pistol Magazine is compatible with ATI GSG 5ProMag GSMA1-22RD: Pistol Magazine GSG-5 .22 LR 22 Round Black 1 Pack DuPont Zytel Polymer