Sig Sauer MPX K 9mm 4.5" Pistol - PCB Folding Brace

Sig Sauer MPX K 9mm 4.5" Pistol - PCB Folding Brace

Designed for professionals, trusted by elite operators, and built for those who demand uncompromising reliability, the SIG SAUER MPX K is the ultimate modular sub-gun platform. Chambered in 9mm and featuring a 4.5" carbon steel barrel, this semi-automatic pistol delivers precision, speed, and adaptability in a compact footprint. Whether you're running suppressed or unsuppressed, the closed bolt gas piston system ensures consistent performance and minimal recoil.

The MPX K now includes the SIG PCB folding pistol brace, allowing for ultra-compact storage and operation in the folded position. With an updated M-LOK handguard and the ultra-fast Timney single-stage trigger co-designed by SIG and Timney, this pistol is engineered for rapid response and pinpoint control. From tactical applications to personal defense, the MPX K is ready to perform in any scenario.

Modular Design
Compatible with multiple barrel and handguard lengths for full customization

Gas Piston System
Closed bolt operation ensures ultra-reliable cycling and reduced recoil

Compact Barrel
4.5" carbon steel barrel offers maneuverability without sacrificing accuracy

Suppressor-Ready
Threaded barrel (M13.5 x 1 mm) makes it easy to mount suppressors

Folding Pistol Brace
SIG PCB brace folds for compact storage and can be fired while folded

Timney Trigger
Single-stage flat trigger delivers ultra-smooth, ultra-fast performance

M-LOK Handguard
Lightweight alloy forend with M-LOK slots for accessory mounting

High-Capacity Magazine
Includes one 35-round polymer MPX magazine for extended shooting

Durable Finish
Hard coat anodized receiver resists wear and corrosion

Professional Grade
Trusted by military and law enforcement worldwide

Specifications

• Caliber: 9mm Luger
• Barrel Length: 4.5 in (114.3 mm)
• Barrel Material: Carbon Steel
• Twist Rate: 1:10
• Thread Pitch: M13.5 x 1 mm
• Action Type: Semi-Automatic
• Operating System: Closed Bolt Gas Piston
• Stock Type: SIG PCB Folding Pistol Brace
• Grip Type: Polymer
• Trigger Type: TIMNEY Single Stage
• Trigger Shape: Flat
• Foreend Type: Alloy
• Accessory Rail: M-LOK
• Magazine Type: MPX
• Magazine Included: (1) 35-round Polymer Magazine
• Receiver Finish: Hard Coat Anodized
• Overall Length: 22.25 in (565 mm)
• Overall Width: 2.4 in (61 mm)
• Height: 8 in (203 mm)
• Weight: 5 lb (2.3 kg)
• Forward Assist: No