use RIG gun grease
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Clean/Oil/grease all good, but another way is to wrap it in a silicone cloth, 1 gallon bag, vacuum seal or push out the air with a couple of silica desiccants and oxygen absorbers and it is ready to use years later. No oxygen, no moisture, no rust.
For a long gun, Brownells has some long seal-able bags, although one might have to remove the pistol grip to use them.
Clean/Oil/grease all good, but another way is to wrap it in a silicone cloth, 1 gallon bag, vacuum seal or push out the air with a couple of silica desiccants and oxygen absorbers and it is ready to use years later. No oxygen, no moisture, no rust.
For a long gun, Brownells has some long seal-able bags, although one might have to remove the pistol grip to use them.
V.C.I. gun bags(Volatile Corrosion Inhibitor), Amazon has the 12" x 52" for $12.5 & up, Brownell's should also have them. Not crazy about the attic storage, if it's not a finished living space(climate controlled). When it's 95+ degrees outside, temps could reach 150 degrees, possibly damaging any gaskets/seals, not to mention the extreme humidity.
I have also put a vacuum pump on a glued up 8" PVC pipe tube, pulled a vacuum and then refilled with nitrogen, just to see how it worked. We put in a couple of desiccants and Oxygen absorbers, regardless. My buddy (a welder, so plenty of Nitrogen) buried it about 8 years ago: I am sure he will let me know if it did not work. In any event, getting as much air (with attendant moisture) out of the storage container as practical is the key to using dessicants and O2 absorbers. My friend filled up the empty space with ammo.Likes food saver type product, but for guns? I guess the same concept applies to the vacuum sealed "survivalist" ammo packs?