Williams Universal Fiber Optic Front Sight Choose the Right Height for CVA and Traditions Muzzleloaders This sight is a replacment front sight to work on the CVA and Traditions Muzzleloader. Available in 2 different heights .355" and .405". These heights are measured from the top of the barrel to the top of the sight. If you are hitting low, you need a lower front sight. If you are hitting high, you need a higher front sight. Installation: Fits round barrels with or without dovetail. Dovetailed barrels use an insert... The sight screws into the insert. Barrels that have no dovetail, use the factory original sight screw and front sight screw hole to attach the sight directly. Traditions Rifles: Do not use the sight screws supplied with this sight, you need to use the screws that were used with your factory front sight.