I've used Flitz and some mag polish ....on my Nickel and stainless revolvers.../ and a couple of times, on my semi-auto barrels that I remove from my guns ..( like in a 1911 ) ...
and once in a while ...I'll use some "lead away" cloth ...inside a barrel .../ which is probably equivalent to using Flitz inside the barrel...
but never on a blued gun.
never used a Dremel ...to touch any gun ...anytime.../ they're way too aggressive to use on guns, in my opinion.