The face of the SlantPro rear sight is serrated and slanted forward slightly to eliminate glare and give better sight picture definition. The contoured shape makes the sight more snag resistant, an excellent concealed carry feature. Installs in factory dovetail (factory sight must be removed). 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.