The Novak Carry Rear Sight for the Glock fits the factory dovetail as a direct replacement (some minor fitting may be required). This replacement rear sight for the Glock features a quality Novak cut as well as a strong steel construction and matte black finish. The Novak Rear Sight uses a .180" front sight blade height. Gunsmith installation is recommended. FeaturesGenuine Novak Cut SightHigh Quality Steel ConstructionMatte Black Finish DISCLAIMER: This product is not manufactured, authorized, endorsed, or warranted by GLOCK. GLOCK does not warrant or represent that this product is compatible with GLOCK pistols.