Experience the pinnacle of magazine craftsmanship with the Auto Ordnance Thompson Drum Magazine from ProMag. Meticulously engineered using a blend of traditional and modern manufacturing techniques, this magazine combines the time-tested strength of heat-treated high carbon steel with the lightweight durability of DuPont Zytel-based polymer. ProMag's commitment to quality is unmatched. Each magazine undergoes rigorous traditional stamping and welding processes for the steel components, complemented by precise injection molding of Mil-Spec polymer compounds. This ensures robust construction and reliable performance in any shooting scenario. Backed by a lifetime guarantee against manufacturer's defects, the Auto Ordnance Thompson Drum Magazine from ProMag offers peace of mind and superior functionality. Elevate your shooting experience with ProMag - where innovation meets reliability.