I've been using butch's on my customs for a while now and always thought I needed to run some type or rust inhibiting oil as a finisher after getting all my copper and residue out. I was at my gunsmith's shop the other day and asked what he recommended and said he just used butches, cleaned it out good, and ran a few dry patches to finish up. Said that Butch's had some type of lubricant already in it. What do you guys think about this? My first thought was that not actually stopping the chemical reaction of butches with some type of oil, might harm my barrel in the long run. What is everybody's process after getting the copper and fouling out?