I just got a Lyman borescope last Friday. Been wanting one forever. FINALLY I can see what is actually going on inside my barrel! Before, I could wait on cleaning if I knew I would be shooting again soon but once I went at it, it was an OCD nightmare. You know what I mean...reading patches like tea leaves or chicken bones. What is it telling me? I've got about 25 rounds down my coyote killer and it looks good inside. I can tell y'all that it is the best $200 I've spent in a while.