Which of the following information is required for a firearm trace?

The correct answer highlights the essential information needed for a firearm trace. Tracing a firearm involves identifying its chain of ownership and determining its path from manufacturer to the final purchaser. The critical details required for this process include the manufacturer, model, serial number, and caliber or gauge of the firearm.

Each of these elements plays a significant role: the manufacturer helps identify the company responsible for making the firearm, the model provides context about the specific type of firearm, the serial number serves as a unique identifier that can be tracked in databases, and the caliber or gauge indicates the type of ammunition the firearm is designed to use. Together, these details enable law enforcement agencies to access records, understand the firearm's history, and potentially uncover vital information related to criminal investigations.

While other pieces of information—such as the purchase date and location, or the owner's identity—can be helpful, they are not the core requirements for initiating a trace. The type of ammunition used, although relevant in specific contexts, does not directly facilitate the tracing process itself. Thus, focusing on the manufacturer, model, serial number, and caliber or gauge is paramount for conducting an accurate and efficient firearm trace.