I am a big fan of SXS slug guns and bought myself a Brignoli (Italian) sxs slug gun, yes it is made as a slug gun.

If all you want is to put rifle sights on it and blued, I would just visit some LOCAL gunsmiths to you. Almost any smith can do that well.

What else do you need done to it? Shorten the barrels??? Any smith can do that too.