This is the 700 stock I mentioned earlier.
Covered in Polyurethane and damaged. Notice the Walnut is lifeless. Dry as a popcorn fart under all the plastic. No love for about 40 years.
Attachment 88703
Attachment 88704
Attachment 88708
Now two months later, vibrant and beautiful. Notice the "finish" is very thin. It takes YEARS of repeated oiling and handling to achieve the beautiful finish on Milsurps we all love and the OP wishes to replicate. Trying is folly. It's the reason people start waxing their stocks with Gunny paste or Howard's feed and wax. They get to a certain point and the project isn't turning out the way they thought it would so they speed things along. That's my opinion anyway...
Attachment 88705
Attachment 88706
Attachment 88707