Butlersrangers, Thank you for that information. It is very interesting. I have found no markings on the stock. The barrel does have two screws in the holes for a different rear sight. They are 2 1/4" apart and 3 1/4" ahead of the receiver. I'll make the suggested repair to stabilize the crack and releave the stress. That is within my skill set. I don't plan on making any changes other than possibly doing something with the rear sight so the bolt can be removed without the need to re-sight it. I want to be able to pass on some information to my sons who will someday have their turn with this and some others like the 7.7 Arasaka their grandfather brought home from WWII.

There is so much information here. Most of the threads I've been reading are old and I receive a warning about posting on them so I haven't yet posted on some other models I am interested in.
Thanks again, Tom