Well, I have been waiting for this borescope since January when they told me that they hoped it would be available in a few months. Fast forward to my seeing this post by John.... I was at a match out of town but was able to add the item to my cart on Amazon, apply the discount (thanks, John!) and have it arrive at my house when I returned yesterday.
I quickly read the instructions (I have had several Teslong scopes, and still use my Hawkeye which I have had for ~ 10 years).
Here are my impressions:
1. I don't like the cable which attaches the rigid scope to the camera; I find it too short and inflexible
2. I was unable to use the 6mm mirror in my 6 dasher chamber/barrel.... the fit was too tight and it started to get stuck in the bore. I switched to the 22mm mirror, which worked well enough in the 6mm barrel.
3. Perhaps there is a way to focus the borescope when it is fed throught a boreguide into the chamber and barrel, but I was unable to reach the focus ring with the boreguide in place. When I removed the boreguide and fed the Teslong directly (and blindly) into the action/chamber/barrel I was able to reach the focus ring as long as the borescope was not advanced too far into the bore.
4. The focusing is impressive, and I was able to get some amazingly clear view of the chamber and barrel (better that anything I have seen on any other borescope).
Initially, I was going to return the borescope, but having the ability to focus the images and obtain such clarity makes it a keeper for me.