« Reply #2 on: November 22, 2011, 05:25:52 PM »
The primer. It contains salts. Needless to say, salt and steel don't quite agree with each other. Specially in damp environments.
Just wash it off by pouring water or windex down the chamber after a shooting and then clean as normal. It's not going to eat your barrel in seconds. Just don't leave it unwashed for weeks in the damp.

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