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Sig Sauer MPX Sig Sauer MPX K Sig Sauer MPX K Sig Sauer MPX K Trigger Sig Sauer MPX K Shooting Sig Sauer MPX K
Sig Sauer MPX Sig Sauer MPX K Sig Sauer MPX K Sig Sauer MPX K Trigger Sig Sauer MPX K Shooting Sig Sauer MPX K
  • Excellent ergonomics
  • Customizable
  • Great trigger
  • Expensive
Editor’s Note:

The Sig MPX-K utilizes a 4.5-inch carbon steel barrel to help bring the already maneuverable MPX into an even lighter, handier package. Additionally, the MPX-K features a reliable and durable gas-piston system to help that helps reduce recoil and aids in suppression. The MPX also has fully ambidextrous AR-style controls, a Timney flat-face trigger, and boasts modularity that allows users to easily change handguards and barrel lengths.

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Sig Sauer MPX K Specs

Barrel Length
Magazine Capacity
20rd / 35rd
9mm Luger
Overall Length

Sig Sauer MPX K Features

35+1 capacity
Fully ambidextrous AR-style controls
Timney flat-face trigger
Gas-piston operated
4.5" carbon steel barrel
2 M-Lok Slots on handguard

By The Numbers - Sig Sauer MPX K

We had a great experience with the MPX and rang steel, no problem. That said, there are user reports that a suppressor can throw off your shots.
We had one experience where a fully-loaded mag wouldn’t work with us…but that could be a mag issue. Outside of that instance, the gun worked great.
It’s an AR-style PCC…do what you will with it.
The Sig MPX K adopts a familiar AR style that feels right at home if you love the AR platform.

Hands-On Reviews & Related Post

Sig Sauer MPX K Variations & Comparables

Century Arms AP5

Century Arms AP5


A legit clone of the H&K Mp5, with HK machinery to HK specs. The Century Arms AP5 is a great alternative without the super high price tag. Finishing isn’t as nice as the HK but this gun runs with very minimal blowback.

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(1 rating)
Ruger PC Carbine

Ruger PC Carbine


The Ruger PC Carbine is a modernized pistol caliber carbine with tactical features. A wide aftermarket allows for accessories, and the ability to break the gun down and stow it make this a handy gun.

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Sig Sauer MPX K Upgrades & Accessories

final verdict

“Despite some known issues that may require some attention, the Sig Sauer MPX is absolutely worth a look. The combination of familiar ergonomics in a sensibly laid-out package is a winning one in my book. And I think you’ll get what I mean if you manage to get your hands on one.” – John Currie



Video Review of Sig Sauer MPX K

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