Our auto/remote popper target, post testing last weekend. How better to learn spall patterns and overall durability? We should be spending some of the weekend beating the latest version up with several rifles. Give us a comment if you're interested in seeing a video of it in action. ;) The front and back plate of the box is #AR500 just like to target to absorb all the beating you want to give it. These plates protect the controls and mechanisms that make the target return to ready.