I may be wrong (I've only been collecting C96's for about 6 years), but I believe the bolt on the left is from a Cone Hammer. The firing pin was changed to the "lug type" with the Large Ring.The bolt on the right appears to have the "lug type" firing pin with two lugs. This is confusing because it also has the long extractor. I thought the two lug firing pin was introduced along with the short extractor with the small ring model.