Another interesting change was mentioned in the triggers. The side plates or ears of the trigger are thin enough the carbon may have migrated completely through while casing. The oil quench would have been less likely to produce cracks. Interesting change late in the game.

On the headless cocking piece I would guess they are marginally  lighter than the regular one. For target shooters looking for the last little bit of extra accuracy, they may give a slightly faster lock time.