Reliability and Adaptability

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.

Side-Folding Pistol Stabilizing Brace

This revolutionary brace offers maximum flexibility and improved single-handed shooting performance.

The SIG MPX is the world’s first submachine gun that operates with a fully closed and locked rotating bolt system, greatly enhancing operator safety. The SIG MPX employs the SIG SAUER® battle-proven gas-operated short stroke piston system for unequalled reliability in the field, even under the most adverse conditions. The SIG MPX is the only submachine gun that allows the operator to change barrel length, caliber and stock configuration in the field to meet mission requirements. Bolt is held open on last round fired, common to all SIG short stroke piston systems. Easily convertible to 9mm NATO, .357SIG or .40S&W