I have a very similar M92. I don't think your fine rifle needs "restoration". All it requires is removal of any rust by scraping with a flattened brass cartridge case and applying a good gun oil afterwards. The stock and hand guard needs a good lemon oil furniture polish applied vigorously with a soft cloth to remove accumulated dirt /grime. These procedures will not change the original condition. If you start adding finish to the wood, you have changed it.