Sig Sauer MPX K Gen 2 9mm Semi-Auto Pistol with 4.5" Threaded Barrel, Folding Brace & 35-Round Capacity
The MPX K Gen 2 brings Sig Sauer’s proven pistol-caliber gas-piston system into a highly compact 9 mm platform. A 4.5-inch nitrided carbon-steel barrel, full ambidextrous controls, and a factory Timney single-stage trigger give this brace-equipped pistol fast handling and clean, reliable cycling that stand out in the crowded PCC market.
Condition
Overall Condition: Excellent condition, showing only faint signs of any prior use or handling.
Bore Condition: Excellent – Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling – Sharp lands and grooves.
Specific Condition Notes: The pistol shows minimal signs of use, with only faint handling marks visible.
What’s Included
- Sig Sauer MPX K Gen 2 pistol with side-folding 1913-hinge PCB brace
- Six 35-round SIG MPX translucent-polymer magazines
- Factory SIG MPX long-length aluminum M-LOK handguard (loose)
- SIG Sauer factory cardboard shipping box (matching serial)
This Gen 2 MPX uses a short-stroke gas-piston operating system—rare in pistol-caliber platforms—to keep fouling out of the action and ensure consistent performance with suppressed or unsuppressed fire. The closed-bolt rotating bolt design contributes to excellent reliability and accuracy.
The 4.5" carbon-steel barrel is nitrided for corrosion resistance and durability, finished with 13.5×1 LH threads and a factory flash hider for easy suppressor or muzzle-device installation. A 1:10 RH twist stabilizes a wide range of 9 mm loads.
Fully ambidextrous controls include the safety selector, bolt release, and magazine release, giving both right- and left-handed shooters intuitive manipulation. The Timney single-stage trigger breaks at approximately 4.5 lb, providing a crisp, consistent pull.
A monolithic upper with a full-length Picatinny rail mates to an aluminum M-LOK handguard, offering ample space for optics and accessories. The side-folding pivoting contour brace (PCB) lets the shooter reduce the footprint for storage or transport while retaining a solid shooting platform when deployed.