Under Republic Act No. 10591, qualified citizens may own firearms for self-defense, but strict legal obligations apply. If a registered weapon falls into unauthorized hands, it becomes a "loose firearm," and its use in a crime can be an aggravating circumstance leading to heavier penalties. Gun owners face license revocation, suspension, or cancellation if their firearm is used in a crime. They are also liable for negligence if a weapon is lost, and failure to report a lost or stolen firearm within 30 days carries a P10,000 fine.