ProMag Pistol Magazine Springfield M1A/M14 .308 50 Round Black 1 Pack DuPont Zytel Polymer 50RD. It is constructed of DuPont Zytel polymer with injection molded mag follower and stainless steel mag spring. Specifications for ProMag Springfield M1A/M14 .308 50 Round Rifle Magazine: Manufacturer: ProMag Color: Black Fabric/Material: Polymer Magazine Capacity: 50 Round Caliber: .308 Winchester Gun Make: Springfield Armory Gun Model: Springfield Armory M1A Package Contents: ProMag Springfield M1A/M14 .308 50 Round Rifle Magazine What firearm models does the manufacturer say ProMag Springfield M1A/M14 .308 50 Round Rifle Magazine is compatible with? The manufacturer suggests that ProMag Springfield M1A/M14 .308 50 Round Rifle Magazine is compatible with Springfield Armory M1AProMag DRMA2-50RD: Pistol Magazine Springfield M1A/M14 .308 50 Round Black 1 Pack DuPont Zytel Polymer