ProMag Polymer Pistol Magazine Glock 28 .380 ACP 15-Round Black 15RD. The follower is injection molded and the magazine spring formed from heat treated chrome silicon wire. Specifications for ProMag Polymer Glock 28 .380 ACP 15-Round Pistol Magazine: Manufacturer: ProMag Gun Model: Glock 28 Caliber: .380 ACP Magazine Capacity: 15 Round Package Contents: ProMag Polymer Glock 28 .380 ACP 15-Round Pistol Magazine What firearm models does the manufacturer say ProMag Polymer Glock 28 .380 ACP 15-Round Pistol Magazine is compatible with? The manufacturer says that ProMag Polymer Glock 28 .380 ACP 15-Round Pistol Magazine is compatible with Glock 28ProMag GLK-A24-15RD: Polymer Pistol Magazine Glock 28 .380 ACP 15-Round Black