Used SIG Sauer MPX K 9mm Copperhead – 4.5" Barrel, Telescoping Arm Brace, 35-Round Magazine – Black

The SIG Sauer MPX K redefines what a compact pistol-caliber platform can be. Engineered for speed, maneuverability, and adaptability, this short 4.5-inch barrel variant delivers exceptional control and performance in close-quarters applications. Built around a gas-operated, short-stroke piston system, it runs clean and reliably with a wide range of ammunition while maintaining soft recoil impulse.

This MPX K features a factory telescoping arm brace for quick deployment and compact storage.. The precision-machined upper and lower receivers ensure durability, while the ambidextrous controls make operation natural for both left- and right-handed shooters. Chambered in 9mm, it feeds from the proprietary SIG MPX magazine for reliable cycling.

Whether for range training, home defense, or professional use, the MPX K delivers unmatched performance in a compact, modern package. Its modular design allows barrel swaps and caliber conversions, making it a highly versatile platform for any mission.

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