The Maxim Defense PDX9 is the 9mm blowback variant of the PDX platform, using a dedicated 9mm AR-pattern lower that accepts Glock-pattern magazines with a 33-round extended option. The 5.5-inch barrel operates on simple blowback rather than gas impingement, simplifying the design. The Maxim SCW buffer system is adapted for 9mm blowback operation in the same ultra-compact PDX chassis. Type: Semi-Auto Pistol Action: Semi-Automatic Caliber: 9mm Capacity: 33 Year introduced: 2019, USA Weight: 55 oz Overall length: 19.5" Status: Active Intended use: home_defense, competition, range