Meet the MPX

The Next Generation of Submachine Gun


Unconventional design. Unmatched performance. 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. There’s nothing else like it. And it’s only available from SIG.

Respond Confidently and Effectively

Rigorously designed and tested, the MPX was built to withstand any mission or adverse condition.

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.

This Changes Everything

The MPX offers versatility through its modularity, allowing you to adapt it to fit your needs and environment.

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.

Stock Options: Maximize performance while conserving space with telescoping or folding stocks. Pistol configuration also available for the ultimate in compactness.

Make It Yours

Use our vast line of accessories to execute your mission
and remain flexible in the field.

Browse MPX Products

SIGTAC SBX Stabilizing Brace: Improve the single-handed shooting performance of your SIG MPX.

Thread-On SIG-SD suppressor: Maintain your cover with the ability to add a thread-on suppressor.

Rear Charging Handle: Does not interfere with rail-mounted accessories.