Edgar you can find Mike on the Winchester collector site. I bought a pre 64 M70 carbine in 7x57 at an auction. Unfortunately someone drilled a hole through the chamber and completely ruined it
Mike directed me to someone who can help me out with a different 7x57 barrel.
It would be nice if we had a rifle forum to discuss these things. I have asked John about it several times to no avail so far. Maybe if we unite? I know a lot of us have more interests than just Parkers. I especially like pre 64 M70's and custom built rifles.