ProMag 9mm 50-Round Drum Magazine for Sig MPX

The ProMag 50-round drum magazine is designed for use with the Sig Sauer MPX in 9mm Luger. It pairs a DuPont Zytel polymer magazine body with a heat-treated stamped steel upper housing finished in black oxide. The unit uses an injection-molded follower and heat-treated stainless steel wire; it is manufactured in the United States.

Key Specifications

• Holds 50 rounds for extended range sessions and training.
• Designed to fit the Sig Sauer MPX platform.
• Chambered for 9mm Luger (9x19).
• Magazine body constructed from a proprietary DuPont Zytel polymer.
• Upper magazine housing is heat-treated stamped steel with a black oxide finish.
• Features an injection-molded magazine follower.
• Spring and internal wire are heat-treated stainless steel.
• Package dimensions measure 3.15 x 6.75 x 14.55 inches.
• Finish is black.
• Manufactured in the United States.

Built to provide extended capacity while maintaining proper fit for the MPX, this ProMag drum magazine combines durable polymer construction with a steel upper housing for reliable handling under frequent use. Its injection-molded follower and heat-treated stainless wire are intended to support consistent feeding for range work and high-volume training scenarios.