Missouri has no law that imposes a penalty on someone who fails to secure an unattended firearm and leaves it accessible to an unsupervised minor.

However, Missouri prohibits any person from recklessly selling, leasing, loaning, giving away or delivering a firearm to a person under age 18 without the consent of the child’s custodial parent or guardian.¹ Missouri does not otherwise have any laws that penalize individuals for negligently storing or leaving a firearm in a location where a child is likely to gain access to it.

Missouri has no law that requires unattended firearms to be stored in a certain way, although state administrative regulations may govern the safe storage of firearms in other locations.

Missouri also does not require a locking device to accompany the sale of a firearm, and no state statutes require firearm owners to affirmatively lock their weapons.

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1. Mo. Rev. Stat. § 571.060.1(2).[↩]