Mo. Const. art. I, § 23

That the right of every citizen to keep and bear arms, ammunition, and accessories typical to the normal function of such arms, in defense of his home, person, family and property, or when lawfully summoned in aid of the civil power, shall not be questioned. The rights guaranteed by this section shall be unalienable. Any restriction on these rights shall be subject to strict scrutiny and the state of Missouri shall be obligated to uphold these rights and shall under no circumstances decline to protect against their infringement. Nothing in this section shall be construed to prevent the general assembly from enacting general laws which limit the rights of convicted violent felons or those adjudicated by a court to be a danger to self or others as result of a mental disorder or mental infirmity. [Effective - 05 Sep 2014 , see footnote]