When I bought my new safe, my old Stack-On became my ammo cabinet. I simply added four 3/4" plywood shelves braced at all four corners with 1 1/2" sq. stock directly through each other down to the bottom to carry any weight that I thought might collapse a normal self. Been fine for 5-6 years . Bottom shelves are mostly ammo and upper shelves have reloading components. It also makes them adjustable by cutting a couple new corners braces if I need to reconfigure it at some future date. Four .50 cal. G.I. cans easily fit on each shelf. 8 if you double stack them. It was easier than taking all the lag bolts out and pulling it out of the corner it's stashed into .