SIG Sauer MPX K 9mm Pistol, 4.5 in Threaded Barrel, Gas-Piston, Ambi Controls, Tungsten Gray, 3x 20-Round Mags
This SIG Sauer MPX K stands out as a compact, AR-pattern 9mm pistol built around a short-stroke gas-piston system with a closed, rotating bolt. It features a 4.5 inch threaded barrel with a three-prong flash hider, ambidextrous controls, and a continuous top Picatinny rail. It comes with three 20-round MPX magazines and the original box.
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: There are a few mild scuffs and scratches on exterior surfaces.
What's Included
- Original box
- Three 20-round SIG Sauer MPX-pattern polymer magazines
The MPX K configuration pairs a compact 4.5 inch barrel with a right-side ejection pattern and a short vented aluminum handguard. The continuous top Picatinny rail runs from receiver through handguard for uninterrupted accessory alignment. No sights or optics are included.
Its operating system is a short-stroke gas piston driving a closed, rotating bolt. The result is a proven MPX architecture tailored for 9mm performance in a compact pistol platform.
Controls are modern and intuitive: ambidextrous safety selector and ambidextrous magazine release, plus a left-side bolt catch. The pistol uses detachable, proprietary MPX magazines, and this example includes three 20-round mags with a stated capacity of 20+1.
The receiver is aluminum with a Tungsten Gray finish, matched to a short, vented aluminum handguard. A telescoping, non-folding dual-rod brace with a polymer end cap and metal rods provides compact storage and quick length adjustment. A SIG polymer pistol grip completes the setup.
The threaded muzzle is fitted with a three-prong flash hider from the factory. The platform is made in the USA and configured in a 9mm Luger AR-pattern pistol format.