Which of the following is an example of class characteristics?

• A. Caliber of weapon and ammunition
• B. Location of the firing pin
• C. Shape of the firing chamber
• D. All of the above

Answer: (D)

Class characteristics are features that place a firearm or its ammunition into a category, rather than identifying a single, unique weapon. Caliber defines the size class of both the weapon and the ammunition, marking a broad group that uses that same cartridge and projectile size. The location of the firing pin’s strike is tied to the firearm’s design and remains consistent within a given design family, signaling which class of firearms could have produced the mark. The shape of the firing chamber reflects the intended cartridge fit and firearm design, again grouping weapons by shared chamber geometry. Because each of these features points to a category of firearms or ammunition rather than a single, individual gun, all of the above are class characteristics. Therefore, the option that includes all of these is the best choice.