What must be included in an inquiry for a firearms trace?

In an inquiry for a firearms trace, it is essential to include sale information, as this data provides critical insights into the history of the firearm, including where and to whom it was sold. This information is vital for law enforcement agencies to track the chain of custody of the firearm, potentially leading to the identification of suspects or witnesses involved in a criminal incident. Sale information typically encompasses details like the name of the retailer, the purchaser's details, and the transaction date, all of which can aid in further investigation.

Other options, while related to the context of criminal investigations, do not contain the necessary information to effectively trace a firearm's history. For instance, while the manufacturing date could provide a timeline, it does not directly link back to the individuals or circumstances involved in the sale. Similarly, crime location and primary suspect details may be relevant for a broader investigation but do not specifically contribute to the tracing process of the firearm itself.