I tried this combo not too long ago for the first time on my factory barreled rifles and I was amazed. Maybe I wasn't using the right stuff before but I struggled and struggled to get clean patches until I discovered JB/Kroil. I've heard guys refer to JB negatively and abrasives in general negatively. I am thinking twice about using JB on my new Shilen barrel because of this. I have no reason to not like JB personally, in fact I like it a lot. So what's the deal? Has it fallen out of favor? Why? Did it hurt your barrel?