Sig Sauer MPX K Pistol 9mm Luger 4.5″ PCB Brace

Description

The Sig Sauer MPX K is a compact, modular pistol built on a closed-bolt gas-piston system intended for reliable semi-automatic operation. It features a folding SIG PCB pivoting contour brace and an updated M-LOK handguard for accessory mounting and optional suppressor coverage. The MPX K is equipped with a Timney single-stage trigger and a hardcoat anodized aluminum receiver for durable service in a compact package.

Key Specifications

• The caliber is 9mm Luger.
• The barrel length is 4.5 inches.
• The action type is Semi-Auto (closed-bolt gas piston).
• The stock is a SIG PCB folding pivoting contour brace.
• The barrel is cold hammer-forged carbon steel.
• The trigger is a Timney single-stage.
• The handguard system is M-LOK.
• The thread pattern at the muzzle is M13.5 x 1 mm.
• The overall length is 22.25 inches.
• The listed weight is approximately 5 lb (2.3 kg).

Compact and purpose-built, the MPX K packs modular capability into a small footprint with features aimed at users who want a durable, adaptable platform for close-quarters and utility applications. Its combination of a gas-piston operating system, Timney trigger, M-LOK handguard, and folding PCB brace delivers a user-focused balance of reliability, customization, and handling for practical use.

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