ProMag Industries

ProMag magazines are designed utilizing both traditional stamping and welding of heat-treated high carbon steel, and modern precision injection molding of mil-spec polymer compounds. Every ProMag magazine is backed by a lifetime guarantee against manufacturer's defects. Made in USA. Features : - Drum housing constructed of a proprietary DuPont Zytel based polymer - Magazine upper tower has full length steel internal insert stamped and welded like the factory magazine - Injection molded magazine follower - Magazine spring formed from heat treated stainless steel - Made in USA