None of the frames will switch over. They will bolt on, but the provision for the trigger actuator rod is I believe built into the frame. Other than that it would bolt on just fine but without that you've got no trigger operation. Supposedly with no spring (it can be removed and still function) the trigger pull is 1lbs. I don't think you'll really feel the need for leverage at that weight, but I can understand if you're just so used to doubles that you want one anyway.