I just got a new AKM and put 200 rnds of Barnaul FMJ through it.  I brought it home, field stipped it and cleaned it.  Damn, it was dirty!  I cleaned the receiver internals, barrel and gas tube.  Actually the internals weren't that dirty but the gas tube was a friggin nightmare to clean.  I didn't have any really good way to do it either.  So, my question is how far to you experienced darksiders clean your rifle?  Do you do like what I did or do you say f*** the gas tube and just clean the receiver internals?  Also do you use a nylon bore brush or a metal one?  Thanks again.