The MPX Copperhead features a monolithic Elite Series Cerakote® finish upper receiver, with an integrated stock knuckle lower, and a 3.5” barrel with integrated muzzle brake. The MPX Copperhead comes equipped with the new SIG SAUER Pivoting Contour Brace (PCB) giving pistol users a brace that easily adapts to the movement of the shooter’s arm with a patented swivel operation for perfect placement, and can be rapidly deployed.

Unconventional design, unmatched performance, and familiar AR handling. The SIG MPX redefines the submachine gun category with a new level of operator safety, in-field adaptability and proven reliability in the harshest environments. Completely ambidextrous, the SIG MPX is great for left- or right-handed shooters with its dual-sided selector switch, magazine release, charging handle and bolt release. The SIG MPX operates from a fully-closed and locked rotating bolt, offering enhanced reliability and safety in use. A short-stroke gas piston allows the SIG MPX to run all weights and brands of 9mm ammunition with no adjustments to the gas valve.


Mag Type MPX
Barrel Length 3.5 in (89 mm)
Caliber 9mm Luger
Height 8 in [203 mm]
Overall Length 14.5 in [368 mm]
Overall Width 2.4 in [61 mm]
Twist Rate 1:10
Weight 4.5 lb (2 kg)
Operating System Gas Piston

The SIG MPX Copperhead PST 9mm Handgun offers smooth handling and unmatched performance. The MPX Copperhead features a Pivoting Contour Brace (PCB) that rapidly deploys to provide added stability. An integrated muzzle brake on this SIG Copperhead handgun provides improved recoil mitigation, while the rotating bolt ensures reliable power and precision. This tactical 9mm is fully ambidextrous, featuring a dual-sided selector switch, mag release, charging handle, and bolt release. A short-stroke gas piston on the Sig Sauer MPX Copperhead offers optimal accuracy and performance with all weights of 9mm ammo without the need for user-end adjustment. With an M1913 rail for mounting optics, the Sig Sauer MPX Copperhead PST 9mm Handgun offers a highly maneuverable platform designed for comfortable, efficient operation by both right- and left-handed shooters.


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