ProMag Rifle Magazine AR-15 .223 30 Round Blued 1 Pack Steel 30RD. It is constructed of heat treated steel with injection molded mag follower and mag spring formed from chrome silicone wire. Specifications for ProMag AR-15 .223 30 Round Rifle Magazine: Manufacturer: ProMag Color: Blued Fabric/Material: Steel Magazine Capacity: 30 Round Caliber: .223 Remington Gun Make: AR Platform Gun Model: AR-15 Features of ProMag Steel AR-15 .223 30-Round Rifle Magazine Magazine body constructed of heat treated steel with black oxide finish Injection molded magazine follower Magazine spring formed from heat treated chrome silicone wire Package Contents: ProMag AR-15 .223 30 Round Rifle Magazine What firearm models does the manufacturer say ProMag AR-15 .223 30 Round Rifle Magazine is compatible with? The manufacturer suggests that ProMag AR-15 .223 30 Round Rifle Magazine is compatible with AR-15ProMag COLA1-30RD: Rifle Magazine AR-15 .223 30 Round Blued 1 Pack Steel