Product DescriptionNight Fision's Optic Plate + Backup Sight combo delivers a rugged, co-witnessed mounting solution for your red dot. The precision-machined 17-4 stainless steel plate is nitride coated to resist wear and corrosion, ensuring a secure, repeatable fit under recoil. This kit is compatible with Glock Modular Optic System pistols (excluding Slimline series) and pairs with the Holosun 509T footprint. Blacked-out steel backup sights provide a clean sight picture and a lower 1/3 co-witness with most compatible optics. Each package includes extra screws and an installation tool for a straightforward setup.Product HighlightsDesigned for Glock MOS full-size and compact models; excludes Slimline series (e.g., 17, 19, 45, 47 MOS)Compatible with Holosun 509T footprint for secure, precise mountingBlacked-out steel backup sights provide lower 1/3 co-witness and uncluttered sight pictureCNC machined from 17-4 stainless steel and nitride coated for durabilityIncludes extra screws and installation tool for easy installationSpecsCompatibility: Glock MOS models (Full Size & Compact; excludes Slimline)Optic Footprint: Holosun 509TSight Setup: Blacked-out front; blank, anti-glare serrated rear; lower 1/3 co-witnessMaterial: 17-4 stainless steelFinish/Coating: NitridePlate Thickness: 0.2 inIncluded Hardware: Extra screws and installation toolColor: BlackMPN: GLK-OPBS-509T-MOS-ZXZXUPC: 810138540930Brand: Night FisionDisclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product's manufacturer.