Mitch
I had a very bad experience with aqua fortis, I am color blind to the changes that happen with each coat. I built a rifle along the lines of George Schreyer, it was red maple(probably the reason for the bad experience), I am pretty color blind, and could not see that the result, according to my wife was "green", and I panicked and flooded it with more stain. Now it won't stop reacting, even after many coats of baking soda, turns the brass black, and is ugly. I have decided to try and refinish it, it's a dream to shoot and would be a shame to put in the closet and forget.
That's my reasoning that I use Feibing's.