I don't think I've ever heard more than conspicuous jibber jabber and raving of how the "post 64" rifles are junk and the pre-64's are better... so my question is can you list what one should be looking for.. Kind of a hitch-hikers guide if you will.
Can someone cleanly state what parts and processes changed.
OR
The accuracy or other reasons.
So far the only one I remember that was mentioned like that (not that I know this is true)
1) Metal to wood finish "fit" is better on a pre-64?
2) Metal to metal (bolt to action, lug contact, ... ) are tighter ?
3) Blueing is higher quality ?
4) The barrels were made by hot looking Swedish chicks listed in the 223 AI thread.
I was Born in 64 so I want to know....
Lists are meaningless.....I know you want it laid out in print, but you can't have it.
Run (shoot and hunt and abuse if you want) 30-40 of them,and 30-40 of anything else you want that came from a factory, comparably priced. Shoot 20-30,000 rounds through them all (a good start). You'll answer your own question.