Re: Found Grandpa's Gun
A poster here, StoneChimney, as said that he repairs and refurbishes those guns.
Most gunsmiths won't take them in because repairs are time-consuming and frustrating and usually cost more than the gun is worth. If the missing sight is the only problem, and you feel like a little DIY, one can be made from a nickel in an hour or less. They were made a bit oversize and press fitted in, so there is nothing to drill or tap.