John, Check with Chuck but I think the repair books that would list such things as retro fitted single triggers are very incomplete. I agree with Murph's statement completely. As for me any Parker with a factory single trigger be it an earlier single screw or the later two screw devalues the gun in my eye's.
Another thing to keep in mind there are those that are incapable of shooting a single trigger gun without making it balk or double.
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"Much care is bestowed to make it what the Sportsman needs-a good gun"-Charles Parker
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