For use with RWS airguns in place of front sight. It works as a counter-weight for guns that are scoped. It also hides the dovetail that is cut into the barrel when the front sight is removed for scope use. This muzzlebrake comes in different sizes for different models. R-230-2662 is used with RWS Rifle Models 34, 36 and 45. It has an inside diameter of 644"
