According to Missouri Revised Statutes
Chapter 571
Weapons Offenses
Section 571.107
You may not carry on:
12) Any riverboat gambling operation accessible by the public without the consent of the owner or manager pursuant to rules promulgated by the gaming commission. Possession of a firearm in a vehicle on the premises of a riverboat gambling operation shall not be a criminal offense so long as the firearm is not removed from the vehicle or brandished while the vehicle is on the premises;
Does a concealed carry endorsement allow a holder to carry a
concealed pistol on a public bus?
A: No. Only law enforcement, commercial security personnel, and
persons with consent of the owner are exempt from this provision.
(See Section 578.305, RSMo.)
Also:
In accordance with Section 571.107 RSMo., you may not carry a concealed
weapon in the following places:
any police, sheriff, or Highway Patrol office or station without consent;
within 25 feet of any polling place on Election Day;
adult or juvenile jail or institution;
courthouse or facilities;
any meeting of a government body (except by a member with a
concealed carry endorsement);
bar without consent;
airport;
where prohibited by federal law;
schools;
child care facility (without consent of manager);
riverboat gambling facility;
amusement parks;
any church or place of worship; without permission of Minister or
person representing religious organization
any sports arena or stadium (with seating for more than 5,000);
hospitals; and,
private or public property where posted.
Possession of a firearm in a vehicle on the premises of any of the
above-listed locations is not prohibited so long as the firearm is not removed
from the vehicle or brandished while the vehicle is on the premises.
Carrying a concealed firearm in any location specified above is not a
criminal act. However, you can be denied access to the premises or may
be removed from the premises for doing so.
I hope this helps.