From the previous picture post you have a damaged magazine cut-off and a incorrect '96 rear sight. The correct and serviceable cut-off should look like the one posted above, not like the shaft only one you have depicted in IMG 0015 and 9952 of the previous post. Additionally, your rear sight does not appear to have step graduation on it like the one above, rather, the ladder ramp is smooth all the way like a '96 version.
Your rare old beast can indeed be restored with a handful of parts to a version that were mainly updated through arsenal upgrade. An arsenal upgrade is still a desirable weapon if original, the fact that most were upgraded makes yours very rare indeed and worthy of the cost of proper original parts. Just my observations, others on this site are far more knowledgeable than I.