Someone beat you to it, if it needs to go in a box an ammo can or a pelican is just about the best you can getI use ammo cans for ammo. (sorry I couldn't resist.)

I modified this 40mm can to have a locking paddle latch and hinged top to serve as secure storage in one of my trailers.
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Painted it red:
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I use my fat 50 for tools.
That paddle latch looks great, where did you get it?
Javy