ProMag Polymer Pistol Magazine Glock 44 .22 LR 25-Round Black 25RD. The follower is injection molded and the magazine spring formed from heat treated chrome silicon wire. Specifications for ProMag Polymer Glock 44 .22 LR 25-Round Pistol Magazine: Manufacturer: ProMag Gun Model: Glock 44 Caliber: .22 Long Rifle Magazine Capacity: 25 Round Package Contents: ProMag Polymer Glock 44 .22 LR 25-Round Pistol Magazine What firearm models does the manufacturer say ProMag Polymer Glock 44 .22 LR 25-Round Pistol Magazine is compatible with? The manufacturer says that ProMag Polymer Glock 44 .22 LR 25-Round Pistol Magazine is compatible with Glock 44ProMag GLK-A20-25RD: Polymer Pistol Magazine Glock 44 .22 LR 25-Round Black