Ok, picked it up today.... first impressions.... LOTS of cosmo….we will see how easily I can get this out of everything. Stock does not appear to be worked on at all (sharp edges, no signs of sanding, there are a few use marks, dents, etc.) there does appear to be shellac of some kind on the hand guard and stock (though not ruling out cosmo). All metal parts match, and bore/barrel look good so far.
Downside.... not 100% sure, but there seems to be a few areas that could be raised rust on the receiver (opposite side of the pic of course), and some minor pitting on the bolt carrier.
Will take pics once I get it all cleaned up.
Serial number on it is 0174-78 (1978 production as I found out from research here)
Maybe not as great of a deal as I thought, but we will see once clean-up has been done.