In most cases WGRS sights utilize dovetail or existing screws on top of the receiver for installation. The Williams WGRS-CVA Round Receiver Sight is made from an aluminum alloy that is stronger than many steels. Light, rustproof. Williams quality throughout. - Compact low profile - Lightweight, strong, rustproof - Positive windage and elevation locks About Williams Williams Gun Sight Company was started in 1926 by Harvey Williams as a sight manufacture. The company grew its sight manufacturing business over the years then developed a retail store and shooting ranges in Davison, Michigan. In recent years, Williams is the oldest sight company that provides sights to many different gun manufactures.