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David, this sight is designed for installation on shotguns with vent rib barrels and not rifle barrels. A universal Slide-Lok mounting system allows use on any shotgun with a ventilated rib, while a nylon liner protects the rib from damage to its finish. Sights are windage and elevation adjustable. Hardware included. Front diameter is .060"; rear diameter is .035".

this truglo ghost ring is for a vent rib shotgun and clamps on the rib