This bill, the "Federal Firearm Licensee Act," seeks to modernize federal laws governing firearm dealers, which Congress finds have not been updated in over 30 years and contain safeguards that protect dealers engaging in illegal practices. It aims to address the increasing theft of firearms from licensed dealers and curtail the diversion of firearms to criminals by strengthening regulatory oversight and enforcement. Key definitions are introduced, including "facilitator" for commercial marketplaces, "business inventory firearm," and specific definitions for "frame," "receiver," and "semiautomatic shotgun." The bill repeals the temporary Brady provision and several appropriations riders that previously limited the Bureau of Alcohol, Tobacco, Firearms, and Explosives (ATF) in various enforcement actions. The legislation mandates enhanced physical security for licensee premises, requiring applicants to submit security plans and existing dealers to comply with new regulations for locked cabinets, security systems, video monitoring, and access controls. Licensed manufacturers, importers, and dealers must annually certify compliance with these security regulations and reconcile their resale firearm inventory, reporting any missing firearms. Significant changes are made to record-keeping , requiring electronic retention of sales and disposition records, and establishing electronic, searchable databases at the National Tracing Center for all required licensee records. The National Tracing Center will have remote access to query these databases for criminal investigations, and licensed dealers operating retail locations must maintain video surveillance of sales areas. The bill expands background check requirements, including notifying the Attorney General of default transfers and extending multiple firearm sales reporting to include certain semiautomatic rifles and shotguns capable of accepting high-capacity magazines. It also mandates that NICS records be retained for at least 90 business days, rather than being destroyed within 24 hours, to investigate misuse or avoidance of the system. New provisions require licensed dealers to provide safety devices and warnings to purchasers, including materials on suicide prevention, secure storage, and straw purchasing. The Attorney General's authority over license issuance and renewal is strengthened, allowing denial, suspension, or revocation if a license poses a danger to public safety, or if the applicant is unlikely to comply with the law or is otherwise unsuitable. Background checks are now required for dealer license applicants and their employees who handle firearms. The bill increases licensing fees for importers, manufacturers, dealers, and collectors. It also eliminates the obligatory stay of license revocation and certain relief provisions for dealers indicted for serious crimes or with pending disability relief applications. The standard for certain violations is changed from "willfully" to "knowingly," and new civil penalties are introduced for engaging in business without a license and for repeated violations of regulations by licensed dealers, including tiered penalties and immediate license suspension for imminent public safety risks. A new category of licensee, "facilitators" of firearm transfers (e.g., online marketplaces), is established, requiring them to be licensed, inform sellers of transfer requirements, and maintain records. These facilitators face liability if they knowingly transfer firearms without proper background checks. The bill authorizes the hiring of 650 additional ATF industry operation investigators and mandates regular reports on the implementation of the Act and annual analyses of licensed dealer inspections, including those for "high-risk" dealers.