description SIG MPX Overview
The SIG MPX is a modular weapon platform developed by SIG Sauer, primarily chambered in 9x19mm Parabellum with variants in .40 S&W and .357 SIG. It operates via a short-stroke gas piston system, a mechanism typically associated with assault rifles, rather than the direct blowback system common to submachine guns. The platform is offered in pistol, carbine, and PDW configurations and is designed for law enforcement, military, and civilian markets.
help SIG MPX FAQ
Does the SIG MPX use a direct impingement system like an AR-15?
No, despite looking similar to the AR-15, this American-made submachine gun utilizes a short-stroke gas piston system typically found in larger assault rifles. This closed rotating bolt system keeps the action cleaner and cooler than a standard direct impingement system.
What caliber is the SIG MPX chambered in?
The SIG MPX is manufactured by SIG Sauer and is primarily chambered in 9mm Luger. Some variants are also available in .357 SIG and .40 S&W for law enforcement and civilian shooters.
Can I use standard AR-15 handguards on my SIG MPX?
No, despite the AR-style aesthetic, the MPX has a proprietary barrel nut and gas system. You must purchase handguards and accessories specifically designed for the SIG MPX platform.
Does the civilian SIG MPX have a last-round bolt hold-open?
Yes, the civilian versions of the MPX feature a functional last-round bolt hold-open, utilizing standard Glock-compatible magazines in newer Gen II models. This is a feature highly requested by shooters transitioning from the standard AR-15 platform.
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