The ProMag Industries MKA-01 Durable Magazine offers unparalleled reliability and performance for firearm enthusiasts. Engineered for precision, this magazine is built to withstand rigorous use while ensuring easy loading. Crafted in the USA with meticulous attention to detail, each magazine is underpinned by a lifetime guarantee against defects. The springs, made from heat-treated chrome silicon wire, exemplify durability and consistent quality standards throughout the assembly process. Heat-Treated Chrome Silicon Wire Spring Manufactured & Assembled in the U.S.A. Easy Loading Rugged Construction Experience superior reliability with the ProMag MKA-01, your trusted companion for firearm performance.