ProMag magazines are expertly crafted using a blend of traditional methods, such as stamping and welding of heat-treated high carbon steel, and state-of-the-art precision injection molding techniques using Mil-Spec polymer compounds. Each ProMag magazine is backed by a lifetime guarantee, ensuring peace of mind and reliability. The ProMag drum magazine sets the standard with its construction from DuPont Zytel-based polymer. Its upper tower includes a full-length steel internal insert, meticulously stamped and welded to replicate the robustness and precision of factory-made magazines. This design ensures exceptional durability and consistent performance in every use.