I use Acetone- available at hardware and paint stores--- to strip commercial stock finishes. It works fast and reliably. Use glove and a face mask, or a fan blowing the fumes away from you. You don't want to breathe them in.
I strip off all the metal from the wood, then stand the stock butt down, in a metal tray I have. The acetone is applied with one of those cheap foam rubber brushes , beginning at the top, so that any drips streak down the rest of the stock I am stripping anyway. I have found that acetone will strip off the finish as fast as I can apply it, leaving very little sanding to do, and no work with steel wool. I understand that acetone is one of the ingredients in "Strip-Ez", but I have not looked at a container of that stuff now for several years. I won't swear that is the case, because I don't remember right now.
Anyway, most of these commercial finishes are acrylic lacquers, and they take some strong chemicals, or a lot of elbow grease, to take them off. I can understand why some people simply scrape these finishes off. Its a lot easier to scrape the finish off, than to sand it off.
The first time I tried the Acetone, I had purchased a quart of it for another project, and had it on hand. I thought, what the heck?--- why not try it, and see how it works. I was shocked how quickly I had all the finish and Paint off a much better piece of wood than I dreamed was under that junk.
Understand the precautions prudence suggest anyone take when using strong chemicals, but other than that, I think Acetone has been the fastest finish and paint remover I have found.
At least consider it. :thumbsup: