RE: tru oil
mause TruOil is basically polyurethane. It's not an "oil" like linseed. It doesn't really penetrate the wood much, it's more a sealant/protectant. You'll have to completely strip the finish before staining it. If you want a darker finish then get some of Birchwood Casey's Walnut Stain. Put as many coats of stain on it as you prefer. Just allow the stain to dry overnight between layers tho. After 3-4 coats the wood will appear nearly black (unless you either dilute the stain first or your stock is nearly blonde) and matte finished. Fine steel wool will knock that matte coat off (sand with the grain) and will actually look VERY good by itself. But you'll have to put a few layers of TruOil over it just to protect the wood and finish. (Let the stock dry at least 24 hours after the last coat of stain before you begin to Tru Oil it.) BTW, the best way to stain the wood is to lightly wetsand (w/400) the stock first, let dry overnight, wipe the wood smooth and then stain it. The stain will soak right in a freshly sanded/open stock and will look more uniform.
BC also makes some "Stock Sheen & Conditioner" that is milky and has some abrasives in it. It is made for knocking the shine off of TruOil if you want a oil finish look too the stock, yet you'll still have the protection/seal of the Tru Oil. You'll want to wait 48-72 hours after your last coat of Tru Oil before using the Sheen/Conditioner.
Good luck,
RA