ProMag Pistol Magazine Glock 44 .22 LR 18 Round Black 1 Pack DuPont Zytel Polymer 18RD. 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 44 .22 LR 18 Round Pistol Magazine: Manufacturer: ProMag Gun Make: Glock Gun Model: Glock 44 Caliber: .22 Long Rifle Magazine Capacity: 18 Round Color: Black Fabric/Material: Polymer Package Contents: ProMag Glock 44 .22 LR 18 Round Pistol Magazine What firearm models does the manufacturer say ProMag Glock 44 .22 LR 18 Round Pistol Magazine is compatible with? The manufacturer says that ProMag Glock 44 .22 LR 18 Round Pistol Magazine is compatible with Glock 44ProMag GLKA18-18RD: Pistol Magazine Glock 44 .22 LR 18 Round Black 1 Pack DuPont Zytel Polymer