MO HB420

Repeals and replaces section 21.750 to establish state preemption over all firearm, component, and ammunition regulation, making all existing or future local orders, ordinances, or regulations in this field null and void with limited exceptions.

Prohibits counties, cities, towns, villages, and other political subdivisions from adopting any ordinance concerning the sale, purchase, transfer, ownership, use, possession, bearing, transportation, licensing, permits, registration, or taxation (except sales and compensating use taxes) of firearms, components, ammunition, and supplies.

Allows political subdivisions to adopt ordinances that conform exactly with state law sections 571.010 to 571.070 or that regulate open carrying of firearms or discharge of firearms within their jurisdiction in compliance with section 252.243.

In jurisdictions prohibiting open carry, permits open carry if the person possesses a valid state concealed carry endorsement or recognized out-of-state permit, carries only firearms 16 inches or less in overall length, displays the endorsement upon law enforcement demand, and is not disarmed absent reasonable suspicion of criminal activity.

Declares that lawful design, marketing, manufacture, distribution, or sale of firearms or ammunition is not an abnormally dangerous activity or public nuisance, and shields firearms and ammunition manufacturers, trade associations, and dealers from liability suits by political subdivisions while preserving individual citizens' right to sue for negligent or defective design or manufacture.