MP Miller

Buy a cheap gun or apply for a permit.

In Afghanistan we used shipping containers for bunkers. We would place heavy timbers across the top to keep the weight on the frame before putting several feet of dirt down on top of them. The frame of the shipping container is very strong it's the sides and top that are weak. Then if you want to get real fancy you can plywood box in the inside (or even dry wall) and make it like a room. Some of ours were Plywood all around and had bunks built in along the wall so we were always protected.