ProMag Polymer Rifle Magazine AR-15 9mm Colt/SMG Type 30-Round Black 30RD. The follower is injection molded and the magazine spring formed from heat treated chrome silicon wire. Specifications for ProMag Polymer AR-15 9mm Colt/SMG Type 30-Round Rifle Magazine: Manufacturer: ProMag Magazine Capacity: 30 Round Caliber: 9mm Luger Gun Model: AR-15 Package Contents: ProMag Polymer AR-15 9mm Colt/SMG Type 30-Round Rifle Magazine What firearm models does the manufacturer say ProMag Polymer AR-15 9mm Colt/SMG Type 30-Round Rifle Magazine is compatible with? The manufacturer suggests that ProMag Polymer AR-15 9mm Colt/SMG Type 30-Round Rifle Magazine is compatible with AR-15ProMag DRM-A30-30RD: Polymer Rifle Magazine AR-15 9mm Colt/SMG Type 30-Round Black