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.

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.