You’re absolutely right! I just bought a Teslong Borescope and was shocked at the condition of some of my barrels that I thought were “squeaky clean”!$89 model Teslong is awesome to say the least. This gives a very good view of how and what works.
Lots of lessons to be learned with a bore scope.
Thumbs up on that. Just got mine and now I am fretting over all that I see. Ignoring the fire cracking but focusing on the carbon ring.The worst and best tool I’ve bought for cleaning is a borescope. Worst because it can induce needless worries. Best because after you get used to what you’re looking at the feedback is invaluable. Most cleaning solvents work to one degree or another, but seeing the progress guides the effort and process. Without one we’re just guessing.