I assume you are looking for two different barrels -- one for a Sharps reproduction and another in 1.75 - 2.00 inches across the flats for a bench gun. My dad has an old 40 cal. X 1.75" X 42" in a bench gun that will shoot the lights out. Today, I'd contact Green Mountain Barrel Company for both. They do great work, cater to the custom builder and they have value pricing (not cheap but high quality for the $). Hope this helps.