True Oil by Birchwood Casey, can be bought at wally world.
Paint a very light coat over the stock. Allow it to dry for 24 hours. Then mix a 50-50 mixture of oil and mineral spirits. Use this mixture to wet sand the finish. Saturate your sand piper andportion of woodto the point that it feels like its just gliding over the stock. Play special attention to sanding out the drips and runs. When You get done the finish will look cloudy. You need to sand approximately 80 %of the coat away. I start with 320 for the first couple of coats then move to 400, 600, 800,1200. On the last coat I use 1200. The trick is to slowly build up finish. In the endyou buff the cloud out finish for a glossy effect thenyou can use steel wool to "matte" it to your liking.