Missouri Magazine Limit: No Current State Cap

Missouri Revised Statutes section 21.750 states that the General Assembly occupies and preempts the entire field of legislation touching firearms, components, ammunition, and supplies, and bars political subdivisions from regulating their sale, purchase, transfer, ownership, use, keeping, possession, bearing, transportation, licensing, permits, registration, or taxation other than sales and compensating use taxes. Subsection 3 preserves local ordinances that conform exactly with sections 571.010 to 571.070 and ordinances regulating open carrying or the discharge of firearms, and limits how an open-carry ordinance applies to holders of a valid concealed carry endorsement or permit.

There is no federal magazine capacity limit; the 1994 federal assault weapons ban expired in 2004.

Federal baseline verified 2026-10-20. Scope: Detachable magazine round-count restrictions for handguns and long guns. States not listed have no capacity limit.