I have a 586 L-Comp with a pinned front tritium dot ramp sight that has been dead forever. I would like to replace it with something like a red ramp or fiber optic sight.

First, it seems like it should just be a matter of pushing out the pin, swapping the sight, and replacing the pin (I gather a special punch is needed). Is this all that's involved? I'm wondering if the new sight has to be fit (hole drilled) to accept the pin?

Second, where are the best places to look for these sights? Is it best to get them from Smith or is there a better source?

Thanks