I have used it on three guns, and my reloading press. Works great. Though as others have noted not much of a copper solvent (though if the metal is already conditioned with it, copper stick a lot less anyways)
I was able to wipe all of the grime of my revolver with just a micro-fiber cloth, no more cleaner, after treating it twice...except the cylinder face. The forcing cone I had to use a little and it came shiny clean. That is my only disappointment, the cylinder face. I had gotten it shiny clean before conditioning the metal twice. And while the froglube, after it sits, will take more off than the other cleaners I have tried, it still has a solid black carbon deposit. Only thing that takes it off is leadaway clothes, but those are expensive.