Since I didn't back things up with cites, I guess I'll do it now. Everything you need to to know is in RsMO Section 571.030. You may find it here:
http://www.moga.mo.gov/statutes/C500-599/5710000030.HTM
This makes concealed carry illegal:
571.030. 1. A person commits the crime of unlawful use of weapons if he or she knowingly:
"(1) Carries concealed upon or about his or her person a knife, a firearm, a blackjack or any other weapon readily capable of lethal use; or"
Another statute in
This is the exception for vehicles:
"3. Subdivisions (1), (5), (8), and (10) of subsection 1 of this section do not apply when the actor is transporting such weapons in a nonfunctioning state or in an unloaded state when ammunition is not readily accessible or when such weapons are not readily accessible.
Subdivision (1) of subsection 1 of this section does not apply to any person twenty-one years of age or older or eighteen years of age or older and a member of the United States Armed Forces, or honorably discharged from the United States Armed Forces, transporting a concealable firearm in the passenger compartment of a motor vehicle, so long as such concealable firearm is otherwise lawfully possessed, nor when the actor is also in possession of an exposed firearm or projectile weapon for the lawful pursuit of game, or is in his or her dwelling unit or upon premises over which the actor has possession, authority or control, or is traveling in a continuous journey peaceably through this state. Subdivision (10) of subsection 1 of this section does not apply if the firearm is otherwise lawfully possessed by a person while traversing school premises for the purposes of transporting a student to or from school, or possessed by an adult for the purposes of facilitation of a school-sanctioned firearm-related event or club event."
Subdivision (1) of subsection 1 of this section refers to the statute making concealed carry illegal.
No interpretation of the peaceable journey law is required, this behavior is explicitly legal by state statute. You are exempted from the CC statute if you are over 21 (or over 18 and a other stuff), in a vehicle, you lawfully own the weapon, and it's concealable.
I agree. Under Missouri's peaceable journey law, I'm fairly certain the inside of one's vehicle is considered private property. Therefore, the manner in which a person carries their firearm, within their own domain: the private property of one's vehicle interior, is not under the purview of the state. Hence: If Joe Schmo from Albequerque wanted to duct tape a loaded Desert Eagle to his forehead while driving through Missouri, as long as he remains within his vehicle, and is lawfully allowed to posess a firearm, there's nothing unlawful about it.
In 90% of Missouri, he'd even be fine getting out as the obviously visible monstrosity taped to his dome would be considered openly carried. However, toss a blanket over his head, and he would require a valid CCW as it would be "concealed".