ProMag magazines are crafted using a blend of traditional and modern manufacturing techniques. They combine traditional methods such as heat-treated high carbon steel stamping and welding with advanced precision injection molding using Mil-Spec polymer compounds. Every ProMag magazine is backed by a lifetime guarantee against manufacturer's defects, ensuring long-lasting reliability and performance. Introducing the ProMag drum magazine, constructed from durable DuPont Zytel-based polymer. Its upper tower incorporates a full-length steel internal insert that is meticulously stamped and welded to replicate the robust construction found in factory magazines. Elevate your shooting experience with ProMag, where innovative design meets rugged reliability for unmatched functionality in every scenario.