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. This ProMag Drum Magazine is constructed out of DuPont Zytel based polyer and the upper tower has full length steel internal insert stamped and welded like the factory magazine.

Specifications and Features:
40-round magazine
Fits AR-308 / .308 Cal AR type rifles using LR-308 (DPMS) or SR-25 pattern magazines
Magazine body constructed of a proprietary DuPont Zytel based polymer
Magazine spring formed from heat treated chrome silicon wire
Injection molded magazine follower
Does not fit rifles using Armalite pattern magazines
Made in USA

Fits:
AR-308 / .308 Cal AR type rifles using LR-308 (DPMS) or SR-25 pattern magazines