I work on a lot of stocks from general cleaning to restoring and matching varnish and aging colors.

I have used Howard's Feed and Wax for years for cleaning and some restoration work but this will not darken the wood. I use Boiled Linseed Oil when I am trying to restore the aged look and fix stocks that needed some staining initially.

We all have our secret ways of working with our mil surp stocks. The old adage of "Do No Harm" plays well with this kind of work. Strong petroleum products and some chemical cleaners will ruin nice wood so be careful.

If you have a specific problem, post some pictures and let us see. We might suggest a certain approach.

Good luck and keep us informed!