the triggers are limit switches that get activated by the plate that was just shot. All the parts came off of Amazon, a couple of timing relays, lights, and enclosure. All of the steel were scraps I had laying around from years of owning an engineering and fabrication company. I'm an FFL and build a few long range hunting rifles every year as a retirement job. Years ago, I built a target just like it for my friend's 2000 yd range and set it at a mile. I just started shooting it the other day, It should handle 35FPE and will give it a test. It measures 11"x23" and weighs around 15#.