Introducing the SIG MPX, a machine pistol that redefines the category. The SIG MPX is a gas-operated submachine gun designed and manufactured by SIG Sauer, and is primarily chambered in 9×19mm Parabellum cartridge. This video contains updated information on the SIG MPX Carbine version. It shows how to convert it to fully suppressed model with the optional MPX Silencer kit. Place the tube over the muzzle brake and install the nut to convert to a suppressor. It is the first submachine gun to feature a fully closed and rotating bolt and piston system. This was done to enhance the safety of the user and to have a more reliable firearm. It was designed in 2013 and was released to the general public in 2015. It features the SIG Sauer short stroke push-rod gas system to reduce the recoil and improve the reliability of the weapon.
The standard variant of the MPX comes with an 8.0 inch (20.3 cm) barrel and is chambered in 9×19mm Parabellum cartridge. It comes with a collapsible stock and a free-floating rail. It has a cyclic rate of fire of 850 rounds per minute (RPM). The MPX is also available with different barrel lengths, ranging from 4.5- to 16-inch. The MPX submachine gun is only available for military and law enforcement use, while a semi-automatic only version is also available for the civilian market. The semi-automatic version of the weapon can be registered as a Short-Barreled Rifle in most states in the United States.
The standard MPX submachine gun comes with a rear and front flip-up sight that is attached to the integrated rail system on the top of the weapon. One available modification is a SIG reflex sight mounted to the rail instead of the flip-up sights. The MPX has a gas short stroke piston system in order to increase the accuracy of the weapon which operates in closed bolt. It is designed in this way to prevent water or dirt from entering the chamber and causing malfunctions as well as to use a suppressor with greater ease. It features an ambidextrous selector switch for fully automatic (law enforcement/military models) and semi-automatic. It also features an ambidextrous bolt catch, and the weapons exterior appears to be a cross between an AR-15 and a Heckler & Koch MP5A3. The barrel is free-floating and is surrounded by Polymer/Steel Rail mounts.
The MPX, in its second generation, features a system that would allow for conversion from 9mm to .357 SIG or .40 S&W, however, since its inception, first party conversion kits have not been made available for either of the two production generations of the submachine gun. SIG Sauer also used the same gas piston system to develop the SIG Sauer MCX carbine. This new version also show the LE carry bag and the discreet deployment bag that are available options to carry the SIG MPX.