Teslong Borescope Review & Use - Rem 700 5R, WOA SPR, Wilson Combat 6.5 Grendel & 223 Wylde Barrels

Short review of the Teslong Borescope. Then examination of 4 Barrels: Bear Creek Arsenal 6.5 Grendel, Remington 700 5R 308W, Wilson Combat Super Sniper 6.5 Grendel and 223 Wylde barrels.
This is what I bought and reviewed:
www.amazon.com...