Ive just Kinda knicknamed it bore butter. It is made by Brownells. It is J-B Bore compounds. With a new barrel there are usually small imperfections from the milling of the barrel. I usually just mop the barrel with it. About 300-500 strokes before the first round down range just to pollish the **** out of it! After doin this to my 204 and my SASS I swear by it and highly recomend it! They are both sub MOA at 100yds.
I tried to post pics last night. I couldn't get it to work. Don't know how.