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I have an STI TruBor that I shoot in Open... I have gone through many jamming problems, including sending my gun back to STI for a replacement barrel and slide... After getting it back from STI, I added an Aftec extractor... My jamming problems are greatly improved, yet I still do get an occasional jam where multiple bullets collide in the chamber. I have noticed that the flat area on the front of my barrel ramp has what looks like marks from the front of a bullet. I'm wondering if this could be causing my jamming problem? I've never seen this kind of problem in either my Limited or Single Stack guns, so I'm posting this in the Open forum... Does anyone know what causes these marks?