On Youtube there is a guy whose userId is: TheKoba49. He does a lot of videos about firearms and he goes into a great deal of detail. He has about 6 or more videos on the Commission 88 rifle and he goes in the ammo, the problems, the fixes, the markings that indicate what fixes or improvements have been applied to a particular rifle.
This is one of his videos:
Commission 88 part 1.
You can check out his channel or do searches to find all the other of his videos on the Commission 88 rifle.
Richard