Gunwizard, I don't know the reason for you wanting to change but if it's for hunting the dot will be the first thing to go in low light. If you've got a Leupold, the custom shop is your huckleberry. powdr
I'm not sure, but I think a place in Florida could do that. I know they completely build and restore scopes.If they are still in business, the name of the company is ABO USA. I know quite a few guys including myself on the forum have used them.