Experience the superior craftsmanship of ProMag magazines, meticulously crafted with a blend of traditional heat-treated high carbon steel stamping and welding, alongside state-of-the-art precision injection molding using Mil-Spec polymer compounds. Backed by a lifetime guarantee against manufacturer's defects, each ProMag magazine ensures unmatched durability and reliability. The ProMag drum magazine exemplifies this dedication to quality, featuring a construction from DuPont Zytel-based polymer, complemented by a fully integrated steel internal insert in the upper tower, meticulously stamped and welded to replicate the precision of factory magazines.