Well...no. As you can see in the pics, a 1/2'' riser could be used with the 40mm. The rear sight aperture would be around the middle of the scope tube... just a hair higher. But I don't want that. --- I'd rather have the rear sight in the lower third of the 40mm scope tube. That helps if want to use the red dot but don't want to focus through the rear sight aperture. Otherwise, there's a lot of rear sight in the way of the tube face.