That's partially to blame, but the root cause of the scratching is because of the design of the striker/bolt pin. When the striker moves forward and pulls the bolt pin from the bottom it gives rotational push, causing the front of the bolt to rotate up. Since it has to pass the feedport this causes an impact which creates the scratches. It's a pretty poor design.
Quote:
Originally posted by Destructo6
The scratches don't have much to do with full auto. The scratches come from sharp edges inside the bolt way, either from a poorly radiused feed port or protruding feed neck screws.
Polishing out the scratches only removes the evidence, but does not do much for the underlying problem.
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