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The U.S. prohibits firearm purchase among individuals with specific risk factors. These prohibitions are operationalized using background checks for firearm purchase. Despite these restrictions, prohibited persons have obtained firearms after passing background checks, sometimes with devastating effects.

We conducted a mixed‐methods, descriptive study of the records and record‐keeping practices that underpin background checks for firearm transfers. Sources included key informant interviews with individuals working in a leadership capacity with state record‐keeping systems as well as data from state surveys and administrative records. We analyzed quantitative data using descriptive statistics and qualitative data using a thematic analysis approach to code the data and identify themes. Three investigators coded each interview. We returned to all data sources to develop key …