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The GLOCK 17 MOS FS 9MM pistol (PA175S202MOS) comes optic ready right from GLOCK. The Modular Optic System (MOS) offers a convenient way for users to mount reflex sights without costly alterations to an original GLOCK slide. The G17 MOS slide is precision-machined to accommodate most popular optic sights. The multiple plate adapters (included) allow the installation of the optic sights to be done quickly and with ease. In addition to the G17 MOS Gen5 optic system, front serrations have been added for easier and quicker manipulations.