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If I was having this problem, I would want to know why the bullets were getting scratched up. My RRA doesn't make a mark on any bullets or case. I do get a slight primer mark from the firing pin that will get slightly more pronouced the more times it's loaded. I think you may have a burr in the feed path, defective magazine, etc. Does this only happen with a certain magazine type, and does it only happen to the top cartridge or all cartridges from the magazine? I don't believe a properly setup AR-15 should damage the rounds as you describe. Loading down one or two cartridges is really a way of compensating for variables in magazines in battle or tactical situations. Good magazines are critical to smooth feeding in all semi or full autos.