Which term describes characteristics used to identify a specific firearm?

• A. Individual characteristics
• B. Class characteristics
• C. Operational characteristics
• D. Manufacturing characteristics

Answer: (A)

Individual characteristics refer to marks and features that are unique to a single firearm. These arise from minute irregularities and wear created during manufacturing and through the gun’s use, such as distinctive firing-pin impressions, breech-face marks, and the precise rifling impressions they leave on bullets and cartridge cases. When evidence like a bullet or cartridge case is recovered, examiners compare the markings to those produced by a specific suspected firearm. If the unique pattern aligns, it can link that particular gun to the evidence, within the limits of scientific uncertainty.

In contrast, class characteristics are features shared by many guns of the same make and model (like caliber or a general rifling pattern) and can narrow the search to a group but not identify a single weapon. Operational characteristics deal with how the firearm functions in practice (reliability, feeding, ejection) and don’t pin down a specific gun. Manufacturing characteristics are broader production-related features common to many units, not unique to one firearm.