SIG SAUER MPX K 9mm (PMPX-4B-9-35) – 35+1, 4.5" Barrel, Black, PCB Folding Brace
The SIG SAUER MPX K is a modular, compact 9mm pistol-caliber platform built for reliability and adaptability. Featuring a closed-bolt, short-stroke gas piston system, the MPX K excels in durability and consistent cycling—even in harsh conditions or suppressed setups. The system allows rapid barrel and handguard swaps for tailored configurations, making it ideal for personal defense and tactical applications.
A SIG PCB folding brace provides stability in both deployed and folded positions, allowing for ultra-compact storage without sacrificing functionality. The M-LOK alloy handguard is updated for accessory mounting and suppressor accommodation. A lightning-fast flat Timney Trigger delivers precision and fast follow-up shots, maximizing sub-gun accuracy in any shooting environment.
The MPX K ships with one 35-round polymer magazine, and its AR-style controls—including ambidextrous selector, mag release, and bolt release—make operation intuitive for any user. The carbon steel, threaded barrel ensures compatibility with muzzle devices and suppressors.
Key Specifications
| Feature | Value |
|---|---|
| Caliber | 9mm Luger |
| Capacity | 35+1 |
| Barrel Length | 4.5" (Carbon Steel, Threaded M13.5x1mm) |
| Operating System | Closed Bolt Gas Piston |
| Overall Length | 22.25" |
| Height | 8" |
| Width | 2.4" |
| Weight | 5 lbs |
| Twist Rate | 1:10 |
| Handguard | M-LOK Alloy |
| Magazine Type | MPX Polymer (35rd included) |
| Brace | SIG PCB Folding |
| Trigger | Flat Timney |
| Receiver Finish | Hard Coat Anodized |
| Accessory Rail | M-LOK |
Highlights
- Adaptive modular design accepts a variety of handguards and barrels for suppressor compatibility.
- SIG PCB folding brace offers compact storage and operability while folded.
- Timney Trigger ensures crisp, reliable performance in high-volume scenarios.
- AR-style ambidextrous controls for intuitive, rapid operation.
- Suppressor-ready barrel and updated handguard for personalized setup.
- Ships with a 35-round magazine, maximizing firepower in the sub-gun category.
The MPX K is a preferred choice among professionals and civilian shooters looking for supreme reliability, modularity, and compact firepower in a pistol-caliber platform.The SIG SAUER MPX K PMPX-4B-9-35 is a modular, ultra-reliable 9mm pistol featuring a closed bolt gas piston system and a compact folding PCB brace for versatile tactical use.
Key Features
- Short-stroke gas piston system for consistent, clean cycling and durability.
- Modular construction for easy swap of handguard and barrel lengths—suppressor ready.
- SIG PCB folding brace enables stable firing when folded, optimizing for compact transport.
- Flat Timney trigger for crisp, fast shooting.
- M-LOK alloy handguard for accessories and improved heat dissipation.
Technical Specifications
| Specification | Detail |
|---|---|
| Caliber | 9mm Luger |
| Capacity | 35+1 |
| Barrel Length | 4.5" threaded M13.5x1 mm |
| Overall Length | 22.25" |
| Height | 8" |
| Width | 2.4" |
| Weight | 5 lbs |
| Twist Rate | 1:10 |
| Magazine Included | 1x 35rd polymer |
| Brace | SIG PCB folding |
| Controls | AR-style, ambidextrous |
| Handguard | M-LOK |
| Trigger | Timney flat single stage |
The SIG MPX K stands out for its suppressed compatibility, adaptable form factor, and fast action, making it ideal for professionals or serious civilian shooters wanting maximum reliability and modularity in a pistol-caliber platform.
| MANUFACTURER | SIG SAUER |
| MODEL | MPX |
| CALIBER | 9MM |
| TYPE | PISTOL |