Upgrade your G17 Gen3 pistol with the optic-ready Spare Slide from GLOCK. The Slide features MOS technology for easy mounting of red dot optics and front serrations for quicker manipulations. – Package Includes: – GLOCK MOS Slide with assembled internals – GLOCK MOS Cover Plate – GLOCK Standard Sights – Not Included: – Barrel – Recoil Assembly – MOS Adapter Plates (sold separately)