Don't know about St. Louis, but supposedly open carry is ok for most of this side of the state. (not Nevada, MO I hear though) I Have also heard (through the grape vine) that the passenger seat is not always considered openly displayed. The police seem to want your side arm on the car dash. If pulled over, thats where mine will be. (with hands on the window sill and interior lights on and keys on dash as well!)
All hearsay but I haven't had to find out the hard way.
From:
www.wmsa.net/jailcard.pdfSTAY OUT OF JAIL CARD 2002
Missouri Constitution: That the right of every citizen to
keep and bear arms in defense of his home, person and
property, or when lawfully summoned in aid of the civil
power, shall not be questioned; but this shall not justify the
wearing of concealed weapons. Article I, Section 23.
UNIFORM LAW: Often called “preemption” RSMo 21.750.
This law says that local laws regarding firearms and ammunition
cannot be more restrictive than state law. The only
exceptions are for shooting in city limits, and open carry of
firearms. The law only covers firearms, ammunition, ammunition
components, and sales thereof, not knives, BB
guns, martial arts weapons etc.
OPEN CARRY: There is no state law against carrying guns
openly, loaded or unloaded, on foot or in cars, but they must
be easily seen by the casual observer, and recognizable.
Certain cities have laws against open carry. There is no
source to look up the cities with such laws. Cities known to
have banned open carry are St. Louis, CapeGirardeau,
Grandview, N. Kansas City, Belton, Aurora and others.
If stopped with a visible gun in the car:
Pull all the way over to the right.
Stay in the car.
Turn off the car.
Turn off the radio/tape/CD.
Turn on the interior car light.
Keep your hands on top of the wheel.
Inform the officer of the gun immediately.
CONCEALED: Carrying concealed weapons is having
a loaded/functional weapon on or within reach of the
person. A felony under RSMo 571.030 except:
1. Persons in their homes or place of work,
possibly, but not certainly, limited to being inside a building.
2. When hunting and carrying a “projectile
weapon” openly. A “projectile weapon” is a BB gun, bow,
or firearm.
3. “Traveling” peaceably through or within the
state. The definition of “traveling” is uncertain, but it covers
travel within the state as well as across state lines. State v
Collin, 879 S.W.2d 585 (Mo.App. W.D. 1994).
4. When the gun is disabled or unloaded and
ammunition is inaccessible.
Edited to Add:
No, I would not carry if illegal. What's What? That? Oh, That! No, I'm just happy to see you.