I want to purchase a borescope to see what my barrels look like for fouling wear etc. i have read a lot about them but do not really know what to look for and what the various conditions look like. i cant seem to find a tutorial or pictures a book etc of what i am looking for. Does anyone have pics or a link of where to find these? Trying to learn but this one seems to be a tough one to get much info on. Any help or info would be appreciated.