Sig Sauer Sig MPX-K



sig sauer mpx k

The choice of professionals worldwide, the MPX K offers a closed bolt gas piston system that is ultra reliable and durable. As with all MPX, the K is modular allowing for multiple handguard and barrel lengths and is ready to go for suppressor use. For 2019, the K now features the SIG PCB folding brace which allows the K to fold into an ultra-compact size and be operable in the folded position. The K also features an updated M-Lok handguard which is available as accessories in multiple lengths for suppressor coverage. Finally, the K is upgraded with the ultra smooth, ultra-fast Timney Trigger. Co-designed by Timney and SIG, this trigger offers the Timney performance you have come to expect we with the ultimate reliability to make it survive the punishment of a sub gun platform. If you are looking for the ultimate modular sub gun, look no further than the MPX K from SIG SAUER.


Mag Type MPX
Barrel Length 4.5 in (114 mm)
Caliber 9mm Luger
Height 8 in [203 mm]
Overall Length 22.25 in [565 mm]
Overall Width 2.4 in [61 mm]
Twist Rate 1:10
Weight 5 lb (2.3 kg)
Operating System Gas Piston

The SIG MPX is a gas-operated submachine gun designed and manufactured by SIG Sauer, and is primarily chambered in 9×19mm Parabellum cartridge. It is a gasoperated firearm featuring a closed, rotating bolt.[1] These design features, rare in submachine guns, were chosen to enhance the safety of the user and to have a more reliable firearm.[2] It was designed in 2013 and was released to the general public in 2015.[3] It features the SIG Sauer short stroke push-rod gas system to reduce the recoil and improve the reliability of the weapon.

The Sig Sauer Mpx k  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 gun.[4]

SIG Sauer also used the same gas piston system to develop the SIG MCX carbine.

The standard variant of the sig sauer mpx k 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).[5][6]

The MPX is also available with different barrel lengths, ranging from 114 to 406mm (4.5- to 16-inch).[7] 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.[4]

sig sauer mpx k

The standard MPX submachine gun comes with no sights and a full length Picatinny rail system on the top of the weapon. Gen 2 MPX’s come with a flat faced Timney trigger and M-LOK rail.

The MPX has a short-stroke gas piston system in order to increase the accuracy of the weapon which operates in closed bolt.[1] 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.[8] 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 weapon’s 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 Picatinny rail (later M-LOK) mounts.

The charging handle of the weapon is at the back of the weapon, based on the AR-15 design. This is to ensure that cocking the weapon does not interfere with any optics mounted onto the Picatinny rail. The weapon’s rails are made out of cast steel and the standard weapon overall weighs 2.1 kilograms (4.6 lb).


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