Brownells sells a "Military Finish Stain," it works really well on vintage guns like the 1903/A3, 30-40 Krog, P-17, M1, M1 carbine, the .22 trainers and such. I redid my entire collection of Savage 23a's with it and they look like they came right out of a vintage arsenal. A nice deep and patina looking chestnut brown. The more you use the darker it gets and then finish off with a standard linspeed and or linseed oil coating of once a day for a week, once a week for a month and then once a month for 2 months. You will have a finish that even the experts cannot decern unless you botched the sanding or something like that. You can also distress the wood a lil with the back edge of a ballpeen hammer by pressing and rubbing it accross typical worn areas. This will create grain pools for the stain and you will get the very common dark areas found on patina wood.