Description PRODUCT DETAILManufacturer Number: RUG-A1 ProMag Ruger MINI-14 .223 Magazine 20 Rounds Steel Blued Caliber: .223 Remington Capacity: 20 Rounds Body Material: Steel Spring Material: Heat-Treated Chrome-Silicon Wire Follower Material: DuPont Zytel Based Polymer Follower Color: Black Finish: Blued