SIG Sauer MPX K: Compact 9mm, 35rd High-Capacity Semi-Auto
The SIG Sauer MPX K: Compact 9mm, 35rd High-Capacity Semi-Auto is a 9mm pistol caliber carbines from Sig Sauer. It is available from 1 vendor at $2099.99.

Product Information
Name: SIG Sauer MPX K: Compact 9mm, 35rd High-Capacity Semi-Auto
Brand: Sig Sauer
Category: Pistol Caliber Carbines
Caliber: 9mm
Barrel Length: 4.5"
Capacity: 35 rounds
UPC: 798681671762
SKU: UCE3nOtrm
Description
The SIG Sauer MPX K is a semi-automatic 9mm pistol-caliber carbine with a 4.5-inch barrel, 35-round capacity, and 5 lb weight. UPC: 798681671762. Finish is black.
Key Specifications
- UPC: 798681671762
- Action: Semi-Automatic
- Caliber: 9mm Luger (9x19 Para)
- Barrel Length: 4.5 inches
- Capacity: 35 rounds
- Weight: 5 lbs.
- Finish: Black
Features
The MPX K uses a gas-operated rotating-bolt design, which runs cleaner than blowback-operated PCC platforms. The MLOK handguard provides attachment points for lights, grips, or other accessories without adding bulk. The threaded muzzle accepts suppressors and other muzzle devices. The single-stage trigger runs smoothly for quick follow-up shots. The 35-round magazine reduces the frequency of reloads during range sessions or competition stages.
Usage
Used for competition shooting, home defense, and range training. The 9mm chambering has mild recoil relative to rifle calibers. The short 4.5-inch barrel keeps overall length compact, making it manageable in tight spaces. The MLOK rail and threaded muzzle give it meaningful accessory flexibility.
Complete Specifications
| Caliber | 9mm |
| Capacity | 35 rounds |
| Barrel length | 4.5" |
| Overall length | 13.5" |
| Weight | 80 oz |
| Action | Semi Auto |
| Finish | Blued |
| Frame material | Polymer |
| Color | BLACK |
| Stock material | Polymer |
Frequently Asked Questions
What caliber is the SIG Sauer MPX K?
The SIG Sauer MPX K is chambered in 9mm Luger (9x19 Para).
What is the barrel length of the SIG Sauer MPX K?
It has a 4.5-inch barrel.
What type of firearm is the SIG Sauer MPX K?
It is a semi-automatic pistol-caliber carbine chambered in 9mm.
How many rounds does the SIG Sauer MPX K hold?
It has a 35-round capacity.
Is the SIG Sauer MPX K threaded?
Yes. The title lists it as having a threaded muzzle, and the product description confirms it accepts suppressors and other muzzle devices.
Who makes the MPX K?
The MPX K is made by SIG Sauer.
Where can I buy the SIG Sauer MPX K?
Compare current vendor offers on this page.
Customers Say
AI-generated insights derived from customer reviews and discussions on popular gun-enthusiast forums.
The MPX K draws positive feedback, particularly around its compact form and 35-round capacity. The gas-operated action is mentioned favorably for smoother cycling than blowback PCC alternatives, and reliability with standard 9mm loads is generally reported as high.
The MLOK handguard and threaded muzzle are popular with owners who run accessories -- a weapon light or suppressor is a common configuration mentioned in user discussions. Recoil is described as mild and easily manageable.
Price is the most consistent point of debate. The MPX K is expensive relative to budget 9mm PCCs, and buyers often compare it to competing platforms. Those who go ahead typically justify the cost on build quality, the gas-operated action, and the SIG platform's aftermarket support.
Aesthetics get favorable mentions. Overall feedback is positive among owners who understand the platform and its price point, with the compactness, capacity, and gas operation being the most cited positives.
Where to Buy - 1 Offers Available
Price Range: $2099.99 - $2099.99
| Vendor | Price | Condition | Link |
|---|---|---|---|
| Gunbuyer Com | $2099.99 | New | Buy Now |


















