SIG Sauer MPX K 9mm Pistol, 4.5″ Threaded Barrel, Black, 35-Round

Description

SIG Sauer MPX K 9mm Pistol, 4.5" Threaded Barrel, Black, 35-Round

The SIG MPX K is SIG’s 9mm piston firearm. The MPX runs a short-stroke piston and AR-style controls on 9mm, with magazines that are SIG’s own MPX pattern.

It does not take Glock, P320, or AR-15 magazines. The top rail is optic-ready. A factory optic is not installed. Pistols ship with SIG’s folding PCB. The SBR uses a stock and needs NFA paperwork.

This configuration

Copperhead is shorter, at 3.5 in., and ships with a 20-round magazine. The PCC is the 16 in. carbine with a stock. This K is the 4.5 in. pistol. The barrel is threaded M13.5 × 1 mm so you can add a compatible 9mm muzzle device. A suppressor is a separate NFA purchase. The Timney trigger is the reason a lot of buyers pick this K over an older MPX. SIG’s PCB folds for storage, and you can still run the gun folded. This K ships to a licensed FFL as a pistol.

What ships

A factory optic is installed only when this page says so. This item ships to a licensed FFL. See the SIG MPX collection.

Specifications and Included Items

• Model: PMPX-4B-9-35
• Platform: MPX K pistol
• Caliber: 9mm Luger
• Barrel: 4.5 in. carbon steel, threaded M13.5 × 1 mm
• Twist: 1:10
• Overall length: 22.25 in.
• Width: 2.4 in.
• Height: 8 in.
• Weight: 5 lb
• Operating system: Short-stroke piston, closed rotating bolt
• Trigger: Timney single-stage, flat
• Brace: Folding SIG PCB
• Handguard: M-LOK alloy
• Finish: Black hard-coat anodized
• Magazines included: One 35-round MPX polymer magazine
• Sights: Optic-ready rail; no factory optic
• FFL: Pistol; ships to a licensed FFL dealer