Please help a rookie ! Is there difference between the barrel shank measurments of the pre 64 mod 70 and the newer Classic Claw type action barrel .I have a pre 64 barrel but no newer barrel shank to measure . I realize this is pretty basic stuff but I cant find drawings for the newer barrel shank . If anyone could provide me with those dimensions or advise me where to look I would sure appreciate it . Im a student so any advice would help . Thanks !!!