I use this treatment for all virgin metal and those used barrels that I think is down to bare metal after cleaning. Been using it for 3 years and the barrels do let go of lead easier if you have a bad fit slug that starts to lead. Been wondering if any of you use this treatment. I also been using it on milsurp triggers to help slick them up. I gave up on all the new barrel procedure voodoo and start with this and use common sence cleaning from then on. Can’t say any are worse but they do clean better then with out.