These bcd rifles seem to have no set pattern on what parts and markings on them. Since the bcd G43 was basically assembled at Buchenwald, God only knows what processes they used or did not use to complete the rifle. I am sure politics get involved with the acquisition of parts and materials too, who really knows here.
Then, we have the rumor of suspected sabotage of the rifles and their subsequent return for repair (not sure if this is fact or just rumor...correct me if need be here), which can introduce an endless possibility for variations in these, with no way of knowing when the parts were added to the rifle. This is one of the reasons that makes these bcd G43 rifles unique.