Requires a firearm owner to report lost or stolen firearms

This bill requires firearm owners in Missouri to report lost or stolen guns to local law enforcement within 72 hours of discovering the loss. The law mandates that law enforcement agencies enter the firearm's make, model, and serial number into the state's uniform law enforcement system to track these incidents. Owners who fail to comply face escalating penalties, starting with a fine of up to $100 for a first violation and increasing to a misdemeanor charge with a fine up to $500 for third or subsequent violations. The measure directly affects all firearm owners in the state and law enforcement agencies responsible for recording and tracking lost or stolen weapons.