In September 2014, Missouri lawmakers passed SB 656 allowing specially trained school employees to carry concealed guns on campuses.
The age to obtain a concealed weapons permit was also dropped from 21 to 19 [See 2014 Senate Bill 656].
In September 2016, another Senate bill coincidentally numbered SB 656 was passed allowing permitless concealed carry by anyone 19[14][15] years of age or older who may lawfully own a gun.
The bill instituted a de facto elimination of the minimum age for concealed carry.
Among these are restrictions when knowingly in possession of controlled substances, displaying the weapon in an angry or hostile manner, carries concealed upon or about his or her person a knife, a firearm, a blackjack or any other weapon readily capable of lethal use into any area where firearms are restricted under section 571.107.
Exhibits, in the presence of one or more persons, any weapon readily capable of lethal use in an angry or threatening manner.
[18] Missouri allows open carry without a permit, so long as the firearm is not displayed in an angry or threatening manner.
According to RSMo Section 571.030, there is no age limit to openly carry a handgun, long gun or any weapon.