I'm still shopping around for a shotgun for multipurpose deer/turkey/small game hunting. Because money is tight, I figured I'd start with a rifle sight barrel this year. Then next year I'd have the gun's receiver drilled and tapped and then mount a scope. I haven't seen scope mounts/bases for shotguns, though. Plus, I'd have to take the scope off for small game hunting. Kind of a hassle, and extra wear on the parts I'm thinking, though.
Another option I just thought about is installing a ghost ring setup. I figure that the ghost ring is still a little slower to aim with than a scope, but maybe I'm wrong. Anyone using such a setup for deer hunting?