I don't know if I would chock tube any side by side as I think they look odd with tubes. I did have Mike Orlen put choke tubes in a Charles Daly Miruko 20ga O/U that was F/M. Although great guns the Miruko Daly's are not collector grade guns. Mike put tubes in that gun for much less than you would pay elsewhere. I did this because in a gun safe full of shotguns the little Daly is one the two best handling and pointing guns I own. It just seems to fit me. The tubes increased it's usefulness and enjoyment for me many fold.
If I were you I would have the gun opened to IC/M, use it and see how you like it. Then if you want the tight pattern versatility back put the tubes in it.
This will be your gun, it's not a museum piece. If I put a few hundred more into a gun than it's worth but I really enjoy and shoot tha gun well and I am happy who cares.
