Unconventional design, unmatched performance, and familiar AR handling. The SIG MPX redefines the submachine gun category with a new level of operator safety, in-field adaptability and proven reliability in the harshest environments. Completely ambidextrous, the SIG MPX is great for left- or right-handed shooters with its dual-sided selector switch, magazine release, charging handle and bolt release. The SIG MPX operates from a fully-closed and locked rotating bolt, offering enhanced reliability and safety in use. A short-stroke gas piston allows the SIG MPX to run all weights and brands of 9mm ammunition with no adjustments to the gas valve. A full-length picatinny rail allows for solid, consistent mounting of optics and targeting lasers. Every aspect of the SIG MPX firing system has been rigorously designed and tested. Featuring familiar AR controls, you can respond confidently and effectively, even under adverse conditions. The SIG MPX also gives users the freedom to change barrel length and stock configuration, all while in the field.

Short-Stroke Piston System: Reduce recoil and fouling with the gas-operated, short-stroke piston system. The bolt is held open on the last round fired.

Rotating Bolt System: A fully locked and closed rotating bolt system provides maximum safety in case of bullet or water obstruction in the bore.

AR-Style, Ambidextrous Control: No retraining required. The SIG MPX features a familiar, AR-style ambidextrous selector and magazine release.

Monolithic Upper Receiver: The monolithic upper receiver features an integral M1913 rail at 12 o’clock and a free-float barrel system.

Adjustable Barrel Length: Easily adapt to your environment with 4.5″, 6.5″ or 8″ barrel lengths.

Rail-Adaptable Handguards: Choose from rail-adaptable aluminum or carbon fiber handguards.