I recenly posted some rules for defining the "service rifle" for the pre WarII Natiionals. I had indicated that the headless cocking piece had been eliminated. I did not have article handy. Here it is from the June 1936 AMERICAN RIFLEMAN. My previous post related to rifles that had been D&T fro scopes or Lyman 48 sights.
Note that item c. of the National Board regulations eliminates the headless cocking piece
http://i116.photobucket.com/albums/o...ps89ceecad.jpg