Help with storing firearms long-term

[tacticool]

Cosmoline: "me store you long time GI"

[Richard_B]

I seem to recall articles in mainstream magazines such as Field & Stream on how to cache arms for long term storage during the Clinton era.

[Jumping Frog]

Having seen some items stored long term; I'd suggest insulation too. :)
(Experienced capped and sealed waterproof pvc tubing buried and ground didn't insulate enough to prevent condensation- next time it will all/sealed pvc and all go into an even larger PVC sealed pip but space between filled with foam insulation.... then once more- This original failure was a 15 year period time)
Condensation can occur even in vacuum packed sealed tight PVC etc in the tiniest air space/void and desiccant is good, but I'd insulate too... and more cosmolenegrease packing next time.

Condensation will only occur with the water vapor that is already sealed into the PCV tube.

I would suggest purchasing an 8 lb bag of Fresh Step Crystals from Walmart. The Crystals product is 100% dessicant (silica gel). Put the rifle in the PVC tube and then fill the tube space with the Fresh Step Crystals. Do not use a different cat litter product as other products have different ingredients.

The dessicant will prevent all condensation.

[SamBodie]

I'm not an expert but i seem to remember that what could be good for long term storage for metal may not be so good for the wood fixtures. It could pay you to research that some too.
Good Luck with that project!