The tung oil didn't help any. It was originally raw linseed oilicon, and the tung oil has now sealed the grain. It will be opening up a can of worms to now try to strip, stain and refinish. It might make matters worse.

From here, I would just leave it be. It is a lightly rebuilt gun, and a ding or two is to be expected. It's not majorly detracting on a otherwise nice looking gun.