It is basically a big mat pile of very coarse and stiff loose rubber. It is installed against a armor plate wall just in case, but few bullets make it in very far. The rubber catches the bullets and avoids the splatter of lead that happens when bullets hit a conventional deflector plate style bullet trap. This makes less lead dust and contains any slivers for no chance of backsplash. It is also a little quieter. Because of EPA regulations, some ranges have had to take out the old deflector plate and water trough type bullet traps and the rubber berm type is the cheapest to retrofit into a standing building.
I do not know about too many Indiana ranges, but Bullseye Range in Kokomo put in the rubber wall trap quite a while ago.
I do not know about too many Indiana ranges, but Bullseye Range in Kokomo put in the rubber wall trap quite a while ago.