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I have scratches, pitting, rust or some other type of mark on my shotgun bolt. Is it defective?

Marks on shotgun bolt

No.  The marking is from the Italian proof house and certifies that the bolt has been tested and is in conformity with all requirements.  You will typically find these markings on all bolts manufactured by Beretta Italy since 2008.  Please see two examples below of proof house markings. As an additional note, the proof house markings are randomly selected by the proof house, although each symbol represents a specific year.