The Glock 17 MOS Gen5 adds the Modular Optic System cutout to the Gen5 slide, accepting a variety of red dot adapter plates. It retains all Gen5 improvements including the GMB barrel, ambidextrous controls, and flared mag well. The MOS variant has become the default choice for competitive and duty shooters running miniature red dot sights. Type: Pistol Action: Semi-Automatic Caliber: 9mm Capacity: 17 Year introduced: 2017, Austria Weight: 24.87 oz Overall length: 8.03" Status: Active Intended use: Law Enforcement, Competition, Self-Defense