Live in minnesota so it's always humid. Especially during the summer.I sometimes wipe my guns outside with ballistol. The main reason being they somethimes get wet if it starts raining, when I am shooting. But since your liner has started to rust inside the barrel sleeve, I would guess you store the gun in to high humidity?
I have so far never seen that on any of my FX liners. They have all been stored dry. Think internal parts like hammer, springs, and trigger mechanics are not supposed to be oiled.
I personally would not relly on getting the internals of the gun oiled up, but rather store the gun in a drier enviroment.
I'll try a few tips here and do it once every 2-3 months. To minimize any rust.
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