The Night Fision Optic Plate + Backup Sight Combo provides a complete mounting solution for Holosun 509T red dot sights on Glock MOS pistols. This premium system combines precision optic mounting with co-witnessing backup iron sights in one convenient package.Night Fision Optic Plate + Backup Sight ComboCompatible with Glock MOS models (17 19 45 47 etc. - excludes Slimline models)Specifically designed for Holosun 509T red dot sightsMachined from 17-4 stainless steel with nitride coatingCo-witnessing backup sights work with most optics sharing this footprintIncludes installation tool and extra screws for easy setupBuilt to withstand harsh recoil with the tightest tolerances this system offers precision durability and exceptional value for shooters seeking a reliable red dot mounting solution with integrated backup sight capability.