Getting back to the subject at hand and the OP"s original subject. I have had the older M-70's (vintage 1973) and now I have a couple on the newer ones made in South Carolina. My opinion is the newer ones definitely appear better made, although I fail to see the huge advantage in the CRF. The push feed was very simplistic and worked flawlessly for me.
One of my new ones is a super grade the fit and finish is very good, real deep high gloss blueing, nicely proportioned stock in a real nice piece of wood. And shoots consistant 1" groups with the 165gr nosler accubonds.
So if I would suggest getting one of the newer ones, I do not think you will be disappointed.