Dave, my unit with the 8.5 mm (not 8 mm as I originally stated) is approximately 39" long.
The viewing screen, similar to what you see on modern digital cameras, is in color. The "Inspection" scope has really enlightened me about the bores of my traditional muzzleloaders.
I had been cleaning in the traditional fashion of flushing 2 or 3 times with water that has a bit of dish detergent. Then, I used alcohol or WD40 to displace or remove water until I had the chance to do a thorough cleaning at home.
Once home, I tried water with dish soap, Ballistol and Moose Milk as cleaners one time or another for a final cleaning. A final application of a rust preventative (EezOx or Barricade) and it was done. All the above was using just cleaning patches. The bores looked clean and shiny with a bore light dropped in.
When I used the Inspection scope, the view was disturbing. There was gunk and even some orange oxidation spots in the corners of the rifling grooves! This was in ALL my muzzleloaders that had been meticulously cleaned.
My solution? I used a nylon bore brush for a few strokes. Then I used a patch over the bore brush to wipe the crud out. The inspection scope showed a much different picture after that. The no longer was residual schmutz (dirt) or rust in the rifling!
That residual likely was nothing harmful, and many people never use a bore brush, but I am a much happier shooter without it.
Ron
