Every Walmart that I have been in carries a product called Birchwood Casey Tru-Oil. It is usually with the gun cleaning supplies. This is a formula of tung oil designed for gun finishing. The bottle is small looking but it is enough for at least 2 guns. Rub it in with your bare hands until there are no runs. Wait several hours between coats. As the finish builds up it takes very little for each new coat. I usually apply 8-10 coats and wipe down with 0000 steel wool when finished.
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