I think Fred (sharpshooter) answered this question in the past... IIRC the bolt lugs are considerably beefier, and the receiver has a small(er) ejection port rather than a wide-open hunting action cut for 1960's era iron sights and top loading a blind magazine. I think the receiver is also a little longer around the barrel shank region. I might be wrong... happens time to time Try searching Fred's posts for more info.
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