The CMMG Mk9 is a dedicated 9mm AR built on a full-size 9mm-specific lower receiver that accepts Glock Gen3 magazines natively without an adapter block. The Mk9 lower is machined to the OEM Glock magazine dimensions for reliable feeding. Type: Semi-Auto Rifle Action: Gas-Operated Caliber: 9mm Luger Capacity: 33 Year introduced: 2020, USA Weight: 6.9 oz Overall length: 33.5" Status: Active Intended use: Competition, Home Defense, Range