Night Fision Optic Plate + Backup Sight Combo Features The Night Fision Optic Plate + Backup Sight Combo is machined from 17-4 stainless steel and built to the tightest tolerances which helps the plate withstand the repeated recoil impulses of a duty or competition pistol without loosening over time. The included nitride coating adds a further layer of corrosion resistance on top of the stainless base material protecting the plate from the elements during extended carry or storage. This plate is designed specifically for the Holosun 509T footprint giving shooters a direct secure mounting surface for that optic while also fitting other optics that share the same mounting pattern. Fitment covers full size Glock MOS models including the 19 17 45 and 47 though it excludes Slimline MOS variants. Alongside the optic plate Night Fision includes a set of black sights designed to co-witness with most optics sharing this mounting footprint giving the shooter a reliable backup aiming option if the red dot fails or runs out of battery. Each package ships with extra mounting screws and an installation tool simplifying setup without needing to source separate hardware. Combining the plate and sights into one product saves the shooter from having to purchase and match these pieces separately from different sources. This combo gives Glock MOS owners a complete co-witnessed optic mounting solution backed by Night Fision s reputation for precision sight manufacturing. Night Fision Optic Plate + Backup Sight Combo Specifications Manufacturer: Night Fision Model: Optic Plate + Backup Sight Combo Type: Optic Plate and Sight Combo Color: Black Compatible Hosts: Glock Full Size MOS Holosun 509T Material: 17-4 Stainless Steel Finish: Nitride Includes: Extra Screws Installation Tool Available At: GrabAGun