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SIG MPX
IN PRODUCTION
Quick Overview
Overview
The SIG MPX is a modern submachine gun manufactured by SIG Sauer, chambered in 9×19mm. Unlike most SMGs that use simple blowback actions, the MPX uses a closed-bolt, short-stroke gas piston system derived from the SIG MCX rifle platform, providing superior controllability and accuracy.
Calibers & Ammunition
Dimensions
Overall Length
425mm (16.7 in) stock folded, 610mm (24 in) extended
Barrel Length
114-203mm (4.5-8 in) — multiple configurations
Weight
2.67 kg (5.9 lb) 4.5-inch barrel
Mechanical
Action Type
Gas-operated, short-stroke piston, closed bolt — rifle-derived
Trigger Type
Selective fire (safe, semi, full auto on military models)
Sights Type
Flip-up iron sights, full-length MIL-STD-1913 rail
Magazine Capacity
10, 20, or 30 rounds — translucent polymer
Additional Information
bolt
Rotating bolt — unusual for SMG, reduces recoil
action
Gas-operated, short-stroke piston, closed bolt — rifle-derived system
calibers
9×19mm primary, .40 S&W and .357 SIG conversions available
modularity
Interchangeable barrels and handguards, shared with MCX family
rail_system
Full-length MIL-STD-1913 rail, M-LOK handguard
rate_of_fire
850 rpm
How does the SIG MPX compare?
Pick any other firearm for a side-by-side spec breakdown.