I built my own and it's more like a small vault. I used a corner of my basement that provided me with three concrete block walls under ground. All I had to do was cover the front with a steel framework and skin it with 10 gauge steel sheet. I made my own door and keyless locking system. An inexpensive alarm system completes it.
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Keep your knees in the breeze and your iron in the air.
~Steve
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