Nick
It's the lower edge of the barrel ramp.
What's happening is that the bullet nose is brushing the barrel ramp instead of gliding over the top corner and lifting it slightly. The soft lead contacts the sharp edge, and gouges it. It's not a major issue as long as it feeds and you don't hear a "Ka-Chunk" sound as the slide goes home.
Could be due to a little "wrong" in the feed ramp angle...the barrel ramp angle...or too little gap between the top corner of the feed ramp and the lower edge of the barrel ramp. With the barrel pushed as far back in the frame as it can go, that gap should be .030-.035 inch. It can be a little more...a little...but not less.
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