I am wading into treacherous waters here; BUT, I recently had Briley's put "Invisible" changeable chokes into an old Parker that was choked just too dang full. They send a choke wrench that fits inside the chokes, and when the tubes are screwed in; You just can't see them.
It turned an old one trick pony into a versatile gun I can shoot everything with, unless I want to shoot steel (And I don't). I recently took it to a 5-stand shoot, and an experienced shooter saw it sitting in the rack, and looked at it and pronounced "Well, this gun doesn't have any "chokes" in it!" If your gun is shooting left, then you need to get the stock bent. This leaves a cheekpiece in place, and I, for one, don't mind them.
Sam Ogle, Lincoln, NE