ProMag Rifle Magazine FN Scar 17 .308 20 Round Black 1 Pack DuPont Zytel Polymer 20RD. It is constructed of DuPont Zytel polymer with injection molded mag follower and mag spring formed from chrome silicone wire. Specifications for ProMag FN Scar 17 .308 20 Round Rifle Magazine: Manufacturer: ProMag Fabric/Material: Polymer Magazine Capacity: 20 Round Caliber: .308 Winchester Gun Make: FN Herstal Gun Model: FN SCAR 17 Condition: New Package Contents: ProMag FN Scar 17 .308 20 Round Rifle Magazine What firearm models does the manufacturer say ProMag FN Scar 17 .308 20 Round Rifle Magazine is compatible with? The manufacturer says that ProMag FN Scar 17 .308 20 Round Rifle Magazine is compatible with FN SCAR 17ProMag FNHA4-20RD: Rifle Magazine FN Scar 17 .308 20 Round Black 1 Pack DuPont Zytel Polymer