| SIG MPX | |
|---|---|
| Type | Submachine gun |
| Place of origin | United States[1] |
| Service history | |
| In service | 2015–present |
| Production history | |
| Designed | 2013 |
| Manufacturer | SIG Sauer |
| Produced | 2015–present |
| Variants | See Variants |
| Specifications | |
| Mass | 2.7 kg (6.1 lbs) |
| Length | 425 mm (16.7 in), stock folded 610 mm (24.0 in), stock extended |
| Barrel length | 114 mm (4.5 in) 165 mm (6.5 in) 203 mm (8 in) |
| Cartridge | 9×19mm Parabellum |
| Action | Short-stroke gas-operated, closed rotating bolt |
| Rate of fire | 850 RPM |
| Feed system | 10-, 20-, 30- or 35-round detachable box magazine, 50 round drum magazine |
The SIG MPX is a gas-operated submachine gun designed and manufactured by SIG Sauer, and is primarily chambered in 9×19mm Parabellum. It is a gas-operated firearm featuring a closed, rotating bolt.[2] These design features, rare in submachine guns, were chosen to enhance the safety of the user and to have a more reliable firearm.[3] It was designed in 2013 and was released to the general public in 2015.[4] It features the SIG Sauer short stroke push-rod gas system to reduce the recoil and improve the reliability of the weapon.
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 gun.[5]
SIG Sauer also used the same gas piston system to develop the SIG MCX carbine.