I have been using military surplus CLP on all my firearms and tools for over
15 years to
If you stop and think about it the black oxide finish of tools and bluing
of firearms is the same finish it is just that the steel of the firearms is
polished more before the finish is applied. The bolts on a lot of my rifles
are in the white(unfinished) steel just like the bed and tool post of my
lathe. Break Free CLP is the same as the military version.