Slip it in pvc pipe and you can bury it anywhere, even on your property. A posthole digger doesn't disturb enough earth to show up. They'd have to use ground penetrating radar/metal detector across every square foot of your property to find it.
Metal detectors are our worst enemy. I'm thinking Tennessee Arms and some polymer lowers buried in a similar fashion. The anarchists will just out law uppers as well. They will be tougher to hide.
kwg
