Description
The SIG Sauer MPX K 9mm is a pistol chambered in 9mm Luger with a 4.5-inch barrel and a 35+1 capacity. It carries the build quality SIG Sauer is known for and is ready for carry, home defense, or the range.

SIG Sauer MPX K 9mm Overview
The SIG MPX is a 9mm platform that runs on a short-stroke gas piston instead of a blowback action, which helps it run cleaner and with less felt recoil than most pistol-caliber carbines. Its controls mirror the AR-15, so it is intuitive for anyone who has used one, and it uses MPX-pattern magazines.
Carry and Use
The MPX is a great choice for home defense, training, and competition. The 9mm cartridge is inexpensive to shoot, quiet compared to rifle rounds, and easy to control.
Trigger and Controls
The MPX uses AR-style controls with an ambidextrous safety, magazine release, and bolt catch, plus a familiar AR trigger group. The short-stroke piston system keeps the action cleaner and running reliably.
Sights and Optics
The factory sights give you a clear, fast sight picture for both precision shooting and quick defensive shots.
Caliber
The 9mm Luger is the most popular handgun cartridge in the world. It offers manageable recoil, high magazine capacity, and a huge selection of affordable practice and defensive ammunition, which is why most police departments and the U.S. military carry it.
Why SIG Sauer
SIG Sauer traces its roots back more than 150 years, and its pistols and rifles are carried by the U.S. military, federal agencies, and police departments across the country. That track record means proven designs, quality materials, and strong support for parts and accessories.
Factory Features
Here is how this model is configured from the factory:
- Black Nitride Threaded Barrel
- M-LOK Handguards
- Black Hard Coat Anodized Aluminum Picatinny Rail Receiver
- Black Synthetic Folding Pivoting Contour Brace
- Black Polymer Grips
- Ambidextrous
In the Field
The SIG Sauer MPX K 9mm is ready for everyday carry, home defense, and range training. With 35 rounds on board, you have plenty of capacity. Pair it with a quality holster, spare magazines, and a light and it is ready to go.
Specifications
- Model: MPX K
- Caliber: 9mm Luger
- Barrel Length: 4.5″
- Capacity: 35+1
- Manufacturer SKU: PMPX4B935
- Distributor Item: SS 108768
- UPC: 798681666744
Learn more about SIG Sauer firearms at SIG Sauer.
Care and Cleaning
Cleaning is straightforward. Unload the pistol, field-strip it according to the manual, clean the bore with a brush and patches, wipe carbon from the slide rails and breech face, and apply a light coat of quality gun oil to the contact points. Wipe the exterior with a lightly oiled cloth before storage.
Before You Buy
Federal law requires handgun purchases to go through a licensed dealer, and buyers must be 21 or older to purchase a handgun from a dealer. Some states and localities restrict magazine capacity and certain features, so check your local laws before you order. We ship to the FFL dealer of your choice, and your dealer handles the background check and transfer.
Who It Is For
The SIG Sauer MPX K 9mm is built for shooters who want a dependable, accurate handgun from one of the most respected names in the industry.
Buy the SIG Sauer MPX K 9mm at MAG5 Firearms
MAG5 Firearms is based in Collegeville, Pennsylvania, and ships to licensed dealers across the country. Order the SIG Sauer MPX K 9mm online, choose your FFL at checkout, and we will handle the rest. You can also browse our full selection of handguns. If you have questions about accessories, our team is happy to help.








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