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Sig Sauer MPX K PCB 9mm 4.5" 1:10" Bbl Blk Pistol w/PCB Folding Brace, M-LOK Handguard, & (1) 35rd Mag PMPX-4B-9-35

SKU PMPX-4B-9-35-Sig

This item is currently out of stock and can be backordered.

Get notified when Sig Sauer MPX K PCB 9mm 4.5" 1:10" Bbl Blk Pistol w/PCB Folding Brace, M-LOK Handguard, & (1) 35rd Mag PMPX-4B-9-35 is back in stock

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FFL Requirements
This item can only be shipped to a Licensed Federal Firearms Dealer. Please see our Shipping Policy to review firearms shipping requirements.
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Due to government regulations and/or manufacturer stipulations we are unable to export this item outside of the United States. Please see our Export Policy.


Sig Sauer’s MPX K delivers high performance, versatility, and modularity in a small package. This compact PDW utilizes the proven closed bolt gas piston system which is known for its reliability as well as ruggedness. Like all of the premium firearms in the MPX family, the MPX K is highly modular, allowing the user to interchange handguards, different barrel lengths, and install multiple muzzle devices such as suppressors and brakes. A flared magazine well on the MPX K accommodates fast, intuitive reloads, and texturing on the front of the magazine well provides a handy gripping surface. The MPX K ships with Sig’s exclusive PCB brace for greater control over the weapon during rapid fire, and can be folded away when not in use or for a convenient option for storage and transportation. Other features of the MPX K include a full length picatinny rail for installing iron sights and optics, and ambidextrous controls accommodate both left and right handed shooters. In addition, the MPX K is outfitted with a smooth, ultra-fast trigger that was designed between Sig Sauer and Timney to ensure quick shooting and ultimate reliability.

Features of the Sig Sauer MPX K:

  • Closed bolt gas piston system
  • Modular design: interchangeable barrels and handguards
  • Foldable Sig Sauer PCB brace
  • Full length picatinny rail
  • Flared magazine well
  • Single Stage Timney Trigger


  • Item ConditionNew
  • Caliber:9mm
  • Weight:5.35 lbs
  • Action:Semiautomatic - closed bolt gas piston
  • Safety:Ambidextrous selector switch
  • Sights:N/A
  • Magazines Included:1
  • Magazine Capacity:35 rounds
  • Grips:Polymer grips
  • Barrel Length:4.5 inches
  • Slide Finish:Black
  • Frame Finish:Black
  • Caliber or Gauge:9mm
  • Pistol Night Sights:No
  • Optics Ready:No
  • Barrel Thread Pitch1/2x28
  • Product TypeHandguns
  • UPC798681666744
  • MPNPMPX-4B-9-35

Customer Reviews

Average Rating
July 29, 2022

Such a great gun to shoot. Very accurate, not much recoil to mention & so much fun with the 30-round mag!

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