GLOCK MOS Plate, Size 04, Fits Leupold Footprint, For Glock MOS Gen 5 9mm/40S&W, Black 74011 The GLOCK MOS Adapter Plate 04 is designed to allow users to seamlessly mount red dot optics to the slide of their compatible Glock Gen 5 handgun. This plate is compatible with a range of MOS pistols" including the G17" G19" G45" G47" and G34.