Yes for decades and it is easy. It takes a field stripped firearm, a appropriate sized PVC pipe, 2 PVC caps, and the proper glue to seal airtight.
Field strip the gun and wipe the pieces with your favorite gun oil, then put your gun in the pipe with no padding. Go to your friendly neighborhood muffler or welding shop and get them to fill the pipe with argon. Argon is heavier than air and will displace any air and humidity. A lit candle will tell you when the pipe is full. Seal the end and go bury it. It cannot rust or corrode in the argon. BTW you need some ammo in there too.
I have a PVC fence behind my house!
Field strip the gun and wipe the pieces with your favorite gun oil, then put your gun in the pipe with no padding. Go to your friendly neighborhood muffler or welding shop and get them to fill the pipe with argon. Argon is heavier than air and will displace any air and humidity. A lit candle will tell you when the pipe is full. Seal the end and go bury it. It cannot rust or corrode in the argon. BTW you need some ammo in there too.
I have a PVC fence behind my house!

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