Send them in. Then polish your chamber and replace your extractor
Supposedly there are microscopic differences between each gun that they can detect and that's what makes it like a fingerprint. The whole flaw with the system though is that these microscopic differences will change over time as the gun gets used.will a pistol make different markings on a case as it ejects that another pistol of the same manufacturing and model with the same stile of ejecter? (basicly two pistols made by same manufacture at the same time with identical parts) sorry if this question is to long.