Yep that is pretty bad. looks like your fingerprint on the top photo
The barrel does have quite a bit of tooling type marks in that last picture if that is not mere fingerprints. Its not really bad chatter type marks like I had in one barrel but not a mirror finish either. The top photo without the mirror on seems to show quite a few parallel type scratch marks but they don't show up as much with the mirror on.
I will go and have a play with my scope on a rifle I got a few weeks ago. I couldnt give any advice based on the photos other than you have a bad copper problem.
With the KG12 I use a Parker Hale Jag I use them for everything actually I like the extra surface area they give. I wrap a bit patch around it that is a loose fit so that all the chemical doesn't get squeezed out. I then run it back and forward a few times and add a few more drops after a few passes. Then I will leave it for 15-30 min a commercial break or two then run a dry patch down and inspect. Repeat the process if necessary.
With sweets I do much the same thing but use a nylon brush loose fitting so it can be worked back and forward I keep topping up the brush until it good and wet. With sweets you use quick back and forth strokes to work it into a lather then again let it sit for 15-30 min dry patch and inspect.
I would then run a brass brush with some Hoppes or Butches and then just a wet patch with Hoppes. I do this as a first step always to remove carbon first so the chemicals can get at any copper if there is any.
Also between changing from one chem to another I will run a patch of carby or brake cleaner down the bore esp if the first chem was oily and then you are going to run KG or sweets it need to be dry and free from oil so the next chem can work.
Check out the Parker Hale jags
http://www.midway-australia.com.au/j-de ... 2-caliber/ They are available in nearly all calls not a lot in stock at Midway Aus ATM the Montanna look like a copy of sorts.