In the case of handguns, the rear sight will be mounted on the frame (if the gun is a revolver), or on the slide (in the case of a semi-automatic). Exceptions are possible depending on the type of handgun. E.g., the rear sight on a snub-nose revolver is typically a trench milled into the top strap of the frame, and the front sight is the to-be-expected blade. Certain handguns may have the rear sight mounted on a hoop-like bracket that straddles the slide.