National Instant Criminal Background Check System (NICS) Data Integrity Act of 2023

This bill requires the National Instant Criminal Background Check System (NICS) to retain records related to firearm background checks for as long as needed to determine if a person is barred from gun ownership under federal or state law. It mandates that if NICS hasn't resolved a check within 30 days, it must notify the person in writing and allow them to submit corrections to their records. The bill also specifies that NICS must search key databases - including the NICS Index, National Data Exchange, and crime databases - to verify eligibility. These changes directly affect individuals seeking to purchase firearms and the federal system managing background checks.