ProMag magazines blend traditional craftsmanship with modern technology to achieve outstanding performance. Utilizing both traditional stamping and welding of heat-treated high carbon steel and precision injection molding of Mil-Spec polymer compounds, ProMag ensures durability and reliability. Each magazine comes with a lifetime guarantee against manufacturer's defects. This ProMag drum magazine is crafted from DuPont Zytel-based polymer and features a full-length steel internal insert within the upper tower, stamped and welded just like the factory magazine, ensuring consistent performance and longevity.