Thread: Borescope images

I had a similar experience, a brand new bore I had had images like that and also a brown sort of looking stuff that had me panicking thinking it was rust, this was in a brand new unfired barrel, after some googling I came to the conclusion it is some sort of protective coating that hadn't been cleaned out properly and had baked in, after allot of cleaning it came out and the bore came up perfect, I believe it probably doesn't make that much difference any way and most people don't have a scope so ignorance is bliss.

I cannot remember what got it out in the end, possibly soaked it in Kero, or JB bore paste, but I don't go crazy with that stuff.