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 Sig Sauer MPX Drum Magazine is constructed out of DuPont Zytel based polyer and a heat treated stamped steel upper magazine housing with black oxide finish.

Specifications and Features:
Manufactured from Durable Polymer
Caliber: 9mm Luger
Capacity: 50 Rounds
Stamped Steel Upper Housing
Injection Molded Follower
Stainless Steel Spring
Made in the USA
Black