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Originally Posted by rogue8261
Thanks for the input. To answer the question. I have picked up a few collectors grade unfired weapons in the past, and you wouldn't believe how some people store them. Had one that was full of dirt and dust, and who knows what else. Whatever was in there attracted moisture and caused mild interior rust.
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Any black powder or older weapon which might have had corrosive ammo fired in it needs to be disassembled and detail cleaned as soon as possible after you get your hands on it. The powder residue is hygroscopic and the corrosive salts are well, corrosive.
Unfired weapons are not always unfired.

Many are test fired before shipping, and may, or may not have been cleaned after that, even if the original purchaser did not fire it himself.
Most weapons leave the factory with at least a light coat of oil, but with time, many things are possible. Dust is probably hygroscopic as well, especially if the weapon was stored in a hot, humid climate.
The good news is that you can put lube in the ultrasonic tank after cleaning, and it will get oil deep into every part of the weapon.
TR