Glock 34 Gen3 MOS long-slide competition 9mm. An early factory optic-cut competition Glock on the Gen3 platform before Gen4 MOS became the standard offering. Type: Pistol Action: Semi-Automatic Caliber: 9mm Capacity: 17 Year introduced: 2014, Austria Weight: 22.92 oz Overall length: 8.82" Status: Discontinued Intended use: Competition, Target