I bought a used tracker II with a prodiamond mounted on a homemade rail, since i don't like optics on my shotguns i removed it, and mounted it on my .357 with the factory rail, it sets about half an inch ahead of the hammer ( no need for spur) and still has pleanty of eye releif. As Tim said get a limbsaver, the reason they cost so much is because their worth it. Good Luck, John