I have some 8 inch knockovers from Quality Targets, they're not AR500. I have a 8 inch Colt Speed Plate auto popper and a 1/2 scale IPSC target from MGM targets that ARE made from AR500. The plates work just fine. They've been shot quite a bit and only show a few small dents. AR500 isn't necessary IMO unless you're shooting steel with a rifle.
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