ProMag magazines are expertly engineered through a blend of traditional and modern manufacturing techniques. Combining traditional stamping and welding of heat-treated high carbon steel with cutting-edge precision injection molding of DuPont Zytel-based polymer compounds, ProMag ensures each magazine delivers unparalleled reliability and durability. Backed by a lifetime guarantee against manufacturer's defects, this ProMag drum magazine features a robust design with a full-length steel internal insert in the upper tower, stamped and welded just like the factory original. Constructed from high-quality polymer, it provides exceptional performance and longevity for demanding applications.