EMP, ElectroMagnetic Pulse, is a very real treat as we continue on in the decades to come. They can come from several if not many sources: http://en.wikipedia.org/wiki/Electromagnetic_pulse What if, one of these EMP's hits your town, and you have all your guns, all your ammo, in one of these? What plains should you have in place, to make sure you can get to your cache should the S#$T really hit the fan? Myself, I have old fashioned locks on MOST of my gun safes, and my ammo safe. Yes, they are slower to open, but they will open after an EMP attack.