Update:
I bought a nice lightly used 870 police stock and forend on ebay for $120.
It did have a polyurethane finish on it but I striped it off with Jasco Premium Paint & Epoxy Remover. Pretty cool stuff! It went on like maple syrup but quickly dried to a kind of wet powdery finish. I took this off with steel wool and a AR15 USGI brush. One more coat of the epoxy remover got off the remainder. I then wiped off the rest with a towel (which I then threw away) and hit it pretty good with the steel wool. After all this I took a wet rag to it and cleaned off anything that remained.
The next morning it was bone dry and I put on Formbys Tung Oil Finish which it quickly drank up. Tonight I am going to hit it again really light with the 0000 steel wool and put on the third coat of tung oil. Im using a bore mop to get the oil inside the for end and the stock bolt hole.
Ive read you need to put this on somewhere between 5 and 8 times with 24 hours between applications. Does this sound about right? Any idea how to prevent the cotton cloth and bore mop from drying out between uses? I put them in a ziplock bag and purge the air out but they are completely dry by the morning.
Any idea how this tung oil will react with leather?
Ill be sure to post pictures when its all done!
Thanks, Dan