Mark,
I have one Parker with a .040" full choke barrel. The right barrel is .005". I have found the FC barrel useful in some upland situations where a second shot is needed on a small covey or fleeing quail. My experience is that second shots from a double trigger gun on Calif quail usually means they are out pretty far (thus my pref for a single trigger on quail). With 8's and 7 1/2's, my gun will pattern tightly and not blow apart, and provide extended range for those quail that are doing their terrain following highspeed flight getaways.
