Gen3 subcompact added finger grooves and the integrated locking system. No accessory rail on subcompact frame. Finger grooves were controversial on the short grip but the Gen3 became the dominant subcompact carry Glock until the Gen4 arrived. Type: Semi-Automatic Pistol Action: Striker-Fired Caliber: 9mm Luger Capacity: 10 Year introduced: 1998, Austria Weight: 19.75 oz Overall length: 6.29" Status: Discontinued Intended use: concealed carry, backup, off-duty