The Glock 17 Gen5 MOS (Modular Optic System) is the optics-ready variant of the Gen5, featuring a factory-milled slide with adapter plates for popular red dot sights. Issued to several NATO ally special operations units and LE agencies requiring optic-ready platforms. Type: Semi-Auto Pistol Action: Striker-Fired Caliber: 9mm Capacity: 17 Year introduced: 2019, Austria/USA Weight: 22 oz Overall length: 7.4" Status: Active Military use: Yes Intended use: Military, Law Enforcement, Special Operations