Certainly if there is any original finish remaining I'd think long and hard about doing anything other than cleaning it and maybe re-oiling depending on what the original finish was. Oil can soften some original finishes so its not a cure all.
But I have seen a lot of wood on CMP rifles that was awful, especially those coming out of the Philippines. Some of the Greek returns were pretty bad too. I've seen a few surplus carbines come out of Ethiopia that were worse than awful. My opinion only - anything that a USGI or a US arsenal does to a firearm is part of its history and in most cases should be preserved. Once it leaves our shores I have trouble thinking that what comes back has "added patina (or history)". My bias with little basis in fact.
CMP or other export returns that are in awful shape are a candidate for restoration in my book. I try and start with the least aggressive method and then work up as required. Some of these stocks are so oil/cosmoline soaked nothing short of oven cleaner will work.
Soap and water, paint thinner, lacquer thinner, oven cleaner are my progressive methods. I have not found a lot of use for paint/varnish remover unless a PO re-varnished the stock. I try and avoid sanding except to remove fuzz. I do try and steam out dents. I have occasionally found the need to stain sapwood to match the heartwood, but I've only had a couple stocks that needed that. Depending on the wood, I may use a water, alcohol or oil based stain. For a final finish on a military stock I prefer boiled linseed oil thinned with turpentine. Tung oil does provide better protection but I think it builds a finish that starts to look like varnish if you're not careful.
But I have seen a lot of wood on CMP rifles that was awful, especially those coming out of the Philippines. Some of the Greek returns were pretty bad too. I've seen a few surplus carbines come out of Ethiopia that were worse than awful. My opinion only - anything that a USGI or a US arsenal does to a firearm is part of its history and in most cases should be preserved. Once it leaves our shores I have trouble thinking that what comes back has "added patina (or history)". My bias with little basis in fact.
CMP or other export returns that are in awful shape are a candidate for restoration in my book. I try and start with the least aggressive method and then work up as required. Some of these stocks are so oil/cosmoline soaked nothing short of oven cleaner will work.
Soap and water, paint thinner, lacquer thinner, oven cleaner are my progressive methods. I have not found a lot of use for paint/varnish remover unless a PO re-varnished the stock. I try and avoid sanding except to remove fuzz. I do try and steam out dents. I have occasionally found the need to stain sapwood to match the heartwood, but I've only had a couple stocks that needed that. Depending on the wood, I may use a water, alcohol or oil based stain. For a final finish on a military stock I prefer boiled linseed oil thinned with turpentine. Tung oil does provide better protection but I think it builds a finish that starts to look like varnish if you're not careful.

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