Well, the gas tube and slide turned out pretty good after I figured out what I was doing. It appeared to take about 3 treatments to reach the right color. Unfortunately, I went a little overboard with the rust remover on the other pieces. I ended up having to redo almost the whole gas block, rather than just the inside where the slide makes contact. It looks okay, but I think it might rust. The other piece from inside the forestock looks terrible. No matter how much I cleaned it up, it still got this bronze color in some places.
Also, my camera's memory card died, so no pictures available yet. I'm going to the range today, and will see how it holds up.