Sig Sauer MPX 9mm Pistol with KeyMod Rail and 4.5 Inch Barrel


In stock

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. A full-length picatinny rail allows for solid, consistent mounting of optics and targeting lasers. The MPX K PSB features a 4.5″ barrel, and a short aluminum KeyMod handguard with handstop.

Firearm Features

  • User Changeable Barrels
  • Short Aluminum KeyMod Handguard with Handstop
  • Ambidextrous AR-style Controls

Firearm Specifications

  • Model: MPX K PSB
  • Caliber: 9mm Luger
  • Barrel Length: 4.5″
  • Overall Length: 22.5″
  • Twist Rate: 1:10″
  • Forend Type: Alloy
  • Trigger Weight: 5.5-9 lbs
  • Trigger Type: Mil-Spec
  • Stock Type: None
  • Magazine: (1) 30-Round Polymer Magazine
  • Grip Type: Polymer
  • Receiver Finish: Hard Coat Anodized
  • Width: 2.4″
  • Height: 8″
  • Threads: M1.5x1mm
  • Accessory Rail: KeyMod
  • Operating System: Gas Pistol
  • Weight: 6.2 lbs.

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