I was mistaken about the trigger guard being straightened. The trigger guard on the early "canoe paddle" stocks were straight, unlike later pistol grips trigger guards. This particular gun does not seem to have ever had barrels or stock installed because there is absolutely no wear marking on any part of the bearing surfaces and no sign that the floorplate screw was ever touched. The gun has a small, almost invisible, milling error in the water table that would have made this receiver eligible for use as a cutaway. It would not have made the final inspection with this little defect. It is my understanding that Winchester made the 21 for a short time before introducing the single trigger option. At serial #150, this cutaway could have been made to study the new trigger as well as the unique snap off forend.