ProMag magazines are crafted using a blend of traditional craftsmanship and advanced manufacturing techniques. They incorporate heat-treated high carbon steel, meticulously stamped and welded, alongside modern precision injection molding with Mil-Spec polymer compounds. Backed by a lifetime guarantee against manufacturer's defects, ProMag ensures reliability and durability. The ProMag drum magazine exemplifies this superior construction. Made from DuPont Zytel-based polymer, it features an upper tower with a full-length steel internal insert, meticulously stamped and welded to match the standards of factory magazines. This design guarantees robust performance and seamless operation in any situation.