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Scraping then is from the feed rib of the slide. Here's what the feed rib does as it moves backward and then forward:
As it travels back, the feed rib is in contact with the top cartridge. Its movement can push the cartridge slightly down, compressing the magazine spring further. Then when the slide reaches full rearward travel, the compressed recoil spring beings pushing the slide and with it, the feed rib forward. The feed rib then comes into contact with the rear portion of the cartridge and pushes it from the magazine up to the feed ramp and then the slide's bolt face takes over.
So, next question. Is the grinding happening when the slide is traveling to the back?
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