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 : - Does not fit FN 5.7 Pistol - 55-round drum magazine - Fits the FN 5.7X28MM AR style carbine - Magazine body constructed of a proprietary DuPont Zytel based polymer - Blue steel upper magazine tower - Injection molded magazine follower - Magazine spring formed from heat treated stainless steel - Made in USA