

She shoots wonderfully, after descomo-ing and the like, during the first outing we were hitting an empty propane tank at about 160 meters with no problems with the iron sights. Yes we were shooting corrosive russian surplus, but afterwards I spent about 40 minutes cleaning the rifle.
What I joined here today was to bring up a question and hopefully get some answers because a gun friend of mine suggested I take pictures and put them up. After cleaning the rifle, it was put away in its gunbag for about a week. I pulled it out to discover a dark brown dust coating the inside of JUST the barrel. No other metal parts or the receiver even. Upon inspection and some patches if any kind of saturated patch goes though the rifle, the patch will come out like the one below:
Wet patches:

I figured maybe it was just something with the way I cleaned it, so I did some more cleaning, made sure it was dry and left it for a few days, and low and behold just by sticking a dry patch into the front of the barrel and swabbing around a tiny bit, its still there. It doesn't SEEM to be rust, so I am just looking for some help as to maybe what is causing it.
Dry patches:

Any help would be greatly appreciated.










