Before I bought the Certistrip from Brownells, I did a search and go some K3 stripper for expoy at Walmart. It softened up the finish in the browning stock. Enough that I could scrap it off with a plastic scrapper (I actually used a piece of vinyl siding - which I could shape for the different contours of the stock). I then applied a second coat and used a brass brush to scrub the remaining finish out from the pores in the wood. After final drying and some final sanding and steel wool, I finished with 4 coats of Tru Oil. When the Tru Oil was completely dry, I applied a light coat of satin polyurethane.
I am really pleased with the way it came out. I even like it better than the original finish.