All the one's I've seen people post photo's from don't have enough magnification to really tell you much. Also, most look straight forward (fisheye) and don't have an angled attachment which makes it that much harder to see detail on the lands and grooves. I guess they're good enough to tell you if you're cleaning your bore good enough or not, but that's about it from what I've seen. Even the Lyman BoreCam leaves a lot to be desired, but it's much, much better than those cheap endoscopes.
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