Short-barreled K variant of the MPX — 4.5" barrel, pistol brace, folding stock option for SBR. Mirrors the MP5K footprint in a modern, user-serviceable package. Type: Pistol Action: Semi-Automatic Caliber: 9mm Luger Capacity: 30 Year introduced: 2016, USA Weight: 104 oz Overall length: 29" Status: Active Intended use: Personal Defense, Service