PVC pipe is the usual recommendation right? What do you coat the firearms with? Especially those with polymer frames such as Glocks, XD's, and those with plastic furniture. I've heard wheel bearing axle grease is perfect for long term storage, but will it hurt the polymer frame and plastic furniture? Do you have to seal in a mylar bag? Why not a contractor grade trash bag with a gun that is packed with grease everywhere, all over. Easy to retrieve from the pipe and check. If I remove moisture and oxygen, I should be golden. So I would go below the frost line as my first line, a pvc pipe sealed at both ends as my second, the contractor bag with a gun packed with axle grease and some oxygen absorbers in the pvc tube for good measure. Should I expect rust with this method? What about magazines and their steel springs? How do you prep those? What about ammo? I've heard dessicant is used widely, but once they are full they need to be replaced or dried out. As such I like the oxygen absorber idea. Where do you bury? Tough to do in a suburban park with some giant tube. Then again the mountains are far away. The primary thing I would be protecting against is thieves, so I could do it on my own property, but again, living in the burbs with neighbors windows in clear view, not exactly a clandestine operation... Thoughts? Risks? Better options?