I managed to get it all polished out and re-blued but it was a challenge. We had an folding stock AK...(Type 56) in Gagetown NB that had been picked up after the invasion of 1974. It had a nice coating of simple pinprick rust on one side from the soil it lay on and the other had the wormy lines of rust from the blood of it's owner. The whole affair had been long since scrubbed silver, but the rust pits remained. The barrel, was about perfect inside...