ProMag magazines are engineered using a combination of traditional heat-treated high-carbon steel stamping and welding, along with modern precision injection molding using mil-spec polymer compounds. This blend of construction methods delivers strength, reliability, and long-term durability. Every ProMag magazine is proudly made in the USA and backed by a lifetime guarantee against manufacturer defects. Product Features Constructed from heat-treated high-carbon steel and mil-spec polymer Precision injection-molded components for reliable function 50-round drum capacity for extended shooting sessions Designed to fit Sig P226 pistols Backed by a ProMag lifetime guarantee Made in the USA Product Specifications Manufacturer: ProMag / Pro Mag Industries Model: Drum Mag (DRM-A45) Caliber: 9mm Magazine Capacity: 50 Rounds Additional Features: High-carbon steel body, mil-spec polymer components, black finish, fits Sig P226