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The indoor range i work at uses ground rubber tires also. It is very effective at stopping even the biggest of pistols dead. This range has well over 1 million rounds in it and so far no real damage to the back stop.As stated the more it gets shot the more it fills in. The deepest we have found a bullet lodge is about 9 inches. The stop is just rubber tires(ground up) and a 1/4 inch thick rubber pad over that. We do maitiance on it weekly though. As long as he stays on top of it i dont think he will have issues. The very top does concern me some. I see light from outside comming through. Even if no targets are near top it still needs to be closed off. I think he is going down the right path and is being cautious , Keep up the inspections and good job
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