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Most deck/wood cleaners you can buy in the paint section of your local home improvement/hardware store has Oxalic acid (in reduced concentrations) in it as well if you have trouble finding it.
How about using a Tru-Oil finish? If too shiny for your taste, simply knock off some of the sheen using very fine steel wool. I wonder what the Yugoslavs to originally finish those fine rifles?
I did a Tru-Oil and wax finish on my '53 Tula's stock. I used Howard's Feed'n Wax, rather than the recommended Birchwood Casey gunstock wax (which seems to be impossible to find in Canada). It came out paler than I expected, but I like how it brought out the figuring in the wood grain, and yes, I eventually refinished the gas tube too.