So far I have only used FP-10 anywhere lubrication is needed, including the slide, locking blocks, trigger mechanism, etc. I also use it for cleaning everywhere, including the bore. I find it excellent for all those, and it is especially good on stainless steel. I have some Rugers where the trigger improved a great deal after simply lubing the mechanism parts with FP-10.
BUT, after reading all this, and seeing how many of my guns are bone dry after a month or two without lubrication, I am inclined to try grease in some of the areas with looser tolerances, like the slide to frame rail fit on most handguns. I think the oil works fine when the tolerance is really tight, held in place by surface tension.
I'm also inclined to start using T-9 as my primary outside rust protectant, but that's getting slightly off topic.