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Sig Sauer MPX 9mm 4.5in (1) 30rd Mag Pistol PMPX-4B-9


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The MPX line from Sig Sauer is versatile enough to adapt to any environment you may find yourself in. It features an unconventional design to match its unrivaled performance. Rigorously developed and tested, the MPX was built to withstand any challege thrown its way. The Sig Sauer MPX redefines the submachine category with its high level of modularity and reliability in the worst conditions. There's nothing else out there like the MPX, just how Sig Sauer likes it. Sig Sauer is trusted by many military forces, law enforcement agencies, and commercial users worldwide for their reliable, renowned firearms.

MPX rifles incorporate the following features:

  • Short-Stroke Piston System - Reduce recoil and fouling with the gas-operated, short-stroke piston system. The bolt is held open on the last round fired.
  • Rotating Bolt System - A fully locked and closed rotating bolt system provides maximum safety in case of bullet or water obstruction in the bore.
  • AR-Style, Ambidextrous Control - No retraining required. The SIG MPX features a familiar, AR-style ambidextrous selector and magazine release.
  • Monolithic Upper Reciever - The monolithic upper receiver features an integral M1913 rail at 12 o’clock and a free-float barrel system.
  • SIGTAC SBX Stabilizing Brace (MPX Pistols) - Improves the single-handed shooting performance. MPX Carbines feature a folding, collapsible stock.
  • Rear Charging Handle - Does not interfere with rail-mounted accessories.
  • Stock Options - Maximize performance while conserving space with telescoping or folding stocks.

About Sig Sauer

From humble beginnings as a wagon to factory to one of the world’s largest firearms, optics, and ammunition manufacturers; the history of Sig Sauer is rich in innovation and achievement. After winning a contract from the Swiss government in 1864 for their Prelz-Burnand muzzleloading rifles, the Swiss Wagon Factory change its name to Schweizerische Industrie-Gesellschaf, the Swiss Industrial Company, better known as SIG. In 1949 SIG developed the SIG P49, the predecessor to the P210 and continued developing small arms for the Swiss military and police.

Since then the company has changed its name, acquired other firearm manufacturers, and crossed the Atlantic—setting up headquarters in New Hampshire. However, what hasn’t changed is the innovative spirit that has driven SIG SAUER to develop firearms like the SIG516 rifle, MCX rifle, P320 pistol, and P226 pistol. With clients like the Texas Rangers, United States Secret Service, Navy Seals, and dozens of local law enforcement agencies nationwide; SIG SAUER is there When It Counts.


  • Caliber:9mm
  • Weight:5.6 lbs.
  • Rifle Overall Length:21.75"
  • Action:Gas Piston - Semi-Automatic
  • Safety:AR Selector Switch
  • Rifle Barrel Length:4.5"
  • Rifle Stock:Pistol Brace
  • Scope Mount:Picatinny Rail
  • Magazines Included:(1) 30 Round
  • Iron Sights No
  • Caliber or Gauge:9mm
  • HandednessRight Hand
  • Item ConditionNew
  • Product TypeRifles
  • UPC798681596270
  • MPNPMPX-4B-9

Customer Reviews

Average Rating
December 29, 2020

This platform is simply the best subgun on the market. I have had the 8" version for a few years but was always hesitant to pick up the K version because of other reviews. When Sig released the "Gen 3", I was intrigued. A close friend purchased one from another site (for way more $$$) and after helping test it out I was in love. This thing has the same recoil impulse as it's 8" big brother at only 4.5". AMAZING! Very easy to stay on target between 30-40 yards with double and triple taps. This set up is the ultimate home defense or back pack gun. The price is prohibitive, I know. My wife would kill me if she knew I bought this and I could have paid a credit card off, but once you unpack it, put a sight on it, and take it to the range you will not be disappointed with your purchase.

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August 5, 2020

The MPX is amazing, but what is even more amazing is the customer support and how EuroOptic handled my order. I went out on a limb ordered it on backordered status. Even prior to purchasing, I was able to chat online with a few representatives over several evenings....all of who answered al my questions and didn’t try to sell me or make any promises on this backordered item. They did however explain the backorder process and that at anytime I wanted to cancel I could. So given the environment and lack of availability of most guns and esp the MPX, It was a no brainer. They gave me accurate information and let me know how many were on order and what “number” I was in that order....which put me at ease that no matter how long, if I chose to wait, I would be ensured the MPX. And to my surprise, it came several weeks early...thank you EuroOptic...

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February 21, 2021

As soon as it was in stock, I bought it. I ordered it on Sunday and got it by Tuesday. You can beat that. Love the MPX due to it having so little recoil. It's compact and easy to shoot. Planning to SBR' it and install a proper buttstock on it.

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