Which types of inquiries into the NCIC gun file are preferred to limit the search?

The preferred type of inquiry into the NCIC gun file that limits the search effectively involves the 'SER' (serial number) and 'MAK' (manufacturer). Utilizing the serial number allows for a specific identification of a firearm, distinguishing it from others that may have similar characteristics. The manufacturer's information further narrows down the search by filtering results to only those firearms produced by a specific company. This combination significantly enhances the accuracy of the query by targeting individual items rather than broader categories, which might include many potential matches.

In contrast, while options that include 'type and model' or 'caliber and manufacturer' could refine the search, they do not offer the same level of precision as a query using the serial number. This makes them less effective in honing in on a specific firearm within the NCIC database. Therefore, 'SER' and 'MAK' represent the most efficient method for limiting inquiries in the NCIC gun file.