ProMag Polymer Pistol Magazine FN PS-90/P-90 5.7x28mm 50-Round Clear 50RD. The follower is injection molded and the magazine spring formed from heat treated chrome silicon wire. Specifications for ProMag Polymer FN PS-90/P-90 5.7x28mm 50-Round Pistol Magazine: Manufacturer: ProMag Gun Model: FN PS90 FN P90 Caliber: 5.7x28mm Magazine Capacity: 50 Round Fabric/Material: Polymer Package Contents: ProMag Polymer FN PS-90/P-90 5.7x28mm 50-Round Pistol Magazine What firearm models does the manufacturer say ProMag Polymer FN PS-90/P-90 5.7x28mm 50-Round Pistol Magazine is compatible with? The manufacturer says that ProMag Polymer FN PS-90/P-90 5.7x28mm 50-Round Pistol Magazine is compatible with FN P90 FN PS90ProMag FNH-A3-50RD: Polymer Pistol Magazine FN PS-90/P-90 5.7x28mm 50-Round Clear