I was warned by some wood workers in the know, not to try and stain the stock with typical wood stain. I was instructed to use a dye. I had found a guy on line who made a replacement birch M1 Carbine stock look like a military issue walnut one, so I followed his lead.
I used some Fiebings dark brown leather dye and a cotton swab
I followed with some brown shoe polish
here is what it looks like in the natural light, there are some dark areas, but I think it looks pretty authentic
here I laid it over the top of an unmodified factory stock so you can see what changed