Dave there are quite a few constructive suggestions in this thread already.
As mc points out it could be the restock - wood interference.
It could be worn sears.
It could be trash in the sears. I repeat that there are directions on disassembling a Parker action on the Parker site.
It could be a warped frame from a re-case hardening. But doubletroubles has twice referred to the process as case coloring. We don't know the process that was used for the case coloring or if it even involved re-case hardening.
CJO had a very specific possibility, easily checked.
I wasn't disputing the possibility of re-case hardening causing warpage and the doubling.
I was disputing ed's jumped-to conclusions that it has been re-case hardened and that that re-case hardening caused it to double and his blanket condemnation of the process.
Best,
Mike
