German model P.38 has a repeating cycle of serial
numbers with individually numbered parts
Forensic Technology Inc.
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Gunsights Pro 3.0
Military firearms can be difficult to identify because they typically do not have a caliber designation; symbols and codes are used to identify the manufacturer. Measuring the bore diameter and chamber will normally provide the information needed to make a caliber determination. Knowledge of commonly used military ammunition assists the examiner in determining the caliber designation of a military weapon.