ProMag Rifle Magazine AR-15/M16 .223 & 5.56X45mm 30 Round Black 1 Pack DuPont Zytel Polymer 30RD. It is constructed of DuPont Zytel polymer with injection molded mag follower and mag spring formed from chrome silicone wire. Specifications for ProMag AR-15/M16 .223 & 5.56x45mm 30 Round Rifle Magazine: Manufacturer: ProMag Color: Black Fabric/Material: Polymer Magazine Capacity: 30 Round Caliber: 5.56x45mm NATO .223 Remington Gun Make: AR Platform Gun Model: AR-15 Package Contents: ProMag AR-15/M16 .223 & 5.56x45mm 30 Round Rifle Magazine What firearm models does the manufacturer say ProMag AR-15/M16 .223 & 5.56x45mm 30 Round Rifle Magazine is compatible with? The manufacturer suggests that ProMag AR-15/M16 .223 & 5.56x45mm 30 Round Rifle Magazine is compatible with AR-15ProMag COLA18B-30RD: Rifle Magazine AR-15/M16 .223 & 5.56X45mm 30 Round Black 1 Pack DuPont Zytel Polymer