This bill establishes new security mandates for federally licensed firearms importers, manufacturers, and dealers, aiming to reduce firearm theft from their business premises. It amends title 18 of the United States Code to introduce specific requirements for securing firearms inventory and business records when the licensed premises are not open for business. The legislation also grants the Attorney General authority to prescribe additional security measures through regulation. When a licensed business is closed, all firearms in its inventory must be kept and stored at the licensed premises. Licensees must secure each firearm either with a hardened steel rod through the trigger guard, anchored and protected from bolt cutters, or by storing them in a locked fireproof safe, a locked gun cabinet (with internal firearm security if not steel), or a locked vault. Additionally, all paper records of inventory and transactions must be stored in a secure location like a locked fireproof safe or vault. Future applicants for federal firearms licenses will be required to describe their compliance plans with these new security provisions, which the Attorney General must approve. Non-compliance will incur escalating penalties, starting with a civil penalty of $1,000 to $10,000 for a first violation. Subsequent violations can lead to license suspension until cured, and a third violation mandates license revocation. The firearm storage requirements will take effect one year after enactment, while paper record storage requirements become effective in 90 days.