Sig Sauer’s enhanced factory magazine (part no. 8900828) for the MPX holds 20 rounds of 9mm Luger, pairing metal feed lips for long-term durability with a robust yet lightweight polymer body that resists warping under repeated use. It’s compatible with all generations of the MPX, so owners of an early production gun or a current model can rely on the same magazine. Since it’s manufactured to Sig’s own factory tolerances, it feeds and locks in exactly as the MPX platform was engineered to run. For Sig Sauer MPX owners, this rifle magazine is a dependable factory-correct spare.

Key Specifications

• Chambered in 9mm Luger, matching the MPX’s factory caliber.
• Holds 20 rounds, a standard capacity for the platform.
• Compatible with all generations of the Sig Sauer MPX.
• Built with metal feed lips for enhanced long-term durability.
• Features a lightweight polymer body for shape retention under repeated use.

Frequently Asked Questions

Does this fit every generation of the MPX? Yes, Sig built this magazine to be compatible with all generations of the MPX.

Why combine metal feed lips with a polymer body? The metal lips resist wear at the highest-stress point of the magazine, while the polymer body keeps overall weight down.

Buy the Sig Sauer MPX 20-Round 9mm Magazine

A factory-correct spare keeps an MPX running through a long range session. Order it from our Lubbock, Texas gun shop for fast, insured shipping.