Sig Sauer MPX K 9mm Pistol, 4.5-inch Barrel, Short-Stroke Gas Piston, Side-Folding SIG PCB Brace, 3x 35-Round Mags
This Sig Sauer MPX K is the compact 4.5-inch configuration of the MPX series, chambered in 9mm Luger and built on an aluminum alloy receiver with a hard-coat anodized finish. It uses a gas-operated, short-stroke push-rod system with closed-bolt operation and features ambidextrous controls throughout. A side-folding SIG PCB pistol brace is mounted to the rear 1913 Picatinny interface, and a continuous MIL-STD-1913 top rail runs across the receiver and handguard. It comes with three 35-round MPX magazines.
Condition
Overall Condition: Very good condition, showing only light, superficial signs of prior handling or use.
Bore Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Notes: The pistol shows mild evidence of prior use with small handling marks. It remains in great shape overall.
What’s Included
- Sig Sauer MPX K 9mm pistol
- Three 35-round SIG Sauer MPX translucent polymer magazines with metal feed-lip assemblies
- M-LOK Picatinny rail section installed at 6 o'clock on the handguard
The MPX K layout centers on a 4.5-inch barrel with a threaded muzzle and flash hider, keeping the overall package compact while retaining standard MPX functionality. The gas-operated short-stroke push-rod system and closed-bolt operation define the platform’s operating method.
Controls are fully ambidextrous, including the magazine release and safety selector, with a left-side bolt catch and a right-side bolt-release paddle. A flat-faced trigger is standard. The pistol ships in 35+1 capacity form and includes three 35-round MPX magazines.
The receiver is aluminum alloy with a hard-coat anodized finish. Up front, a short aluminum M-LOK handguard provides accessory mounting, and the continuous MIL-STD-1913 top rail spans the receiver and handguard for mounting compatible equipment as desired.
At the rear, a side-folding SIG PCB pistol brace with Velcro cuff attaches via the 1913 Picatinny interface. The platform is made in the USA. This example has no sights installed from the factory.