The Glock 34 Gen5 MOS Ported Barrel variant ships with Glock's factory-ported barrel, featuring ports cut into the barrel hood and slide to redirect propellant gases upward and reduce muzzle flip. Intended for competition shooters seeking the maximum practical split time. The MOS cut allows optic mounting. Port fouling requires more frequent cleaning than a standard barrel variant. Type: Pistol Action: Striker-Fired Caliber: 9mm Capacity: 17 Year introduced: 2018, Austria Weight: 22.92 oz Overall length: 8.82" Status: Active Intended use: competition