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