For a more authentic finish consider using BLO.
There are multiple ways to apply BLO, the one I have adopted is one that I picked up on another gun forum:
1- Clean the wood with mineral spirits or acetone (whichever I have on hand at the time).
2- Sand wood to desired smoothness.
3- One more wipe down with the mineral spirits or acetone.
4- First application of BLO with a lint-free rag or small brush. After a 10-15 minute wait, I wipe excess BLO from the wood.
5- Allow to dry (no longer tacky to the touch).
6- Light rubbing with 0000 steel wool to remove any surface contaminants and smooth the surface of the finish.
7- Next application of BLO, again wiping excess off after 10 minutes or so.
8- Hit it with the steel wool again.
Repeat steps 7 & 8 as necessary. I usually go with 5 or 6 applications on the initial run, depending on how dry the wood is. You can re-apply the BLO as necessary to maintain the finish on the wood. I usually do it twice a year just to make myself feel good about it.
Carefully dispose of any waste with BLO on it. BLO is exothermic and has been known to burn houses down if not properly disposed of.