The MPX K is a compact pistol configuration of the MPX with a 4.5-inch barrel and pistol brace — a legal non-NFA alternative to the SBR. Highly concealable with the brace folded, the MPX K is a popular suppressor host and PDW-role firearm. Type: Pistol Action: Semi-Automatic Caliber: 9mm Luger Capacity: 30 Year introduced: 2016, USA Weight: 4.7 oz Overall length: 19.5" Status: Active Intended use: law_enforcement, duty, suppressor_host