Most Ruger wooden stocks were sprayed with a thin finish/dye.
Simple to chemically strip such, and dye the wood to user satisfaction. Unfortunately, getting the desired color and finish requires some experience, and some practice.
FWIW, I've repaired/epoxied 1903 Springfield stocks for a friend (RIP, Sarge!), and sold them, on his behalf, as repaired stocks, at gun shows. Most folks could not see the multiple repairs, until repairs were specifically pointed-out. All the stocks were stripped of original finish, as a prerequisite for repair. The repaired stocks sold out in minutes. Just sayin' to establish credentials.
Getting the desired color for your wooden stock will require stripping original finish, re-staining, and re-finishing. Some of this depends on the base wood. Most Ruger wood is decent hard wood, but not highly-figured walnut. Ruger generally says nothing about their wooden stocks.
Many folks like GI walnut stocks for their M1s and M1As. Some folks do not know that later, GI-Issue Birch stocks are denser wood, and far less likely to splitting than walnut.
Even the lighter birch wood can be stained to most any color desired, as long as it is thoroughly stripped and well-prepped.
BTDT.