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WD-40 is a good rust preventive agent. So is Cosmoline, which generally requires that you boil the part to remove it. Lubricants like WD-40, 3 in 1 oil, etc. contain petroleum distillates which evaporate over time leaving behind the solids, GUNK. I wouldn't recommend WD-40 as a general lubricant for a firearm because of this property. It's probably OK for storage.
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