SIG SAUER MPX K 9mm 4.5″ PCB Brace Black

The SIG SAUER MPX K is a compact, modular 9mm pistol platform featuring a 4.5-inch barrel and the SIG PCB folding pivoting contour brace. It uses a closed-bolt gas-piston operating system and is built on a hard coat anodized aluminum receiver for durability and corrosion resistance. The MPX K is configured to accept accessory attachments and is intended for compact carry, range use, and modular setups where a folding brace and suppressor-ready features are desirable.

Key Specifications

• The caliber is 9mm Luger.
• The barrel measures 4.5 inches.
• The action type is Semi-Auto.
• The operating system is a closed-bolt gas piston.
• The barrel material is cold hammer-forged carbon steel.
• The trigger is a Timney single-stage unit.
• The handguard uses an M-LOK interface.
• The stock is a SIG PCB folding pivoting contour brace.
• The receiver finish is black hard coat anodized aluminum.
• The muzzle thread pattern is M13.5x1mm.

Compact and modular by design, the MPX K balances portability with a feature set aimed at users who value adaptable platforms and proven componentry. Its combination of a cold hammer-forged barrel, Timney trigger, gas-piston operation and folding PCB brace allows for configurable setups suitable for range use and compact carry scenarios.