The UDP-9 pistol variant uses the same Angstadt Glock-magazine lower with a 6.5-inch barrel and pistol brace, creating a compact home defense or range pistol in the AR format. Type: Pistol Action: Semi-Automatic Caliber: 9mm Capacity: 33 Year introduced: 2017, USA Weight: 72 oz Overall length: 20" Status: Active Intended use: Home Defense, Compact, Competition