ProMag magazines are made in the USA and backed by a lifetime guarantee against manufacturer's defects. Magazine springs are precision wound using heat-treated chrome silicon wire and each and every step of the assembly process is checked and double checked in order to maintain the same consistent level of quality.Features:Heat-Treated Chrome Silicon Wire SpringManufactured & Assembled in the U.S.A.Easy LoadingRugged ConstructionSpecifications:Caliber: 223 RemingtonType: MagazineCapacity: 10 RoundsColor: BlueFit: Ruger Mini-14Finish: Blued