This is what State law says:
Casinos (Tribal casinos: No A.G. posting required. Non-tribal: A.G. Posting required)
Pursuant to the Tribal Gaming Compacts, casinos located on tribal lands are areas where no firearms will be allowed to be carried by the general public or concealed carry licensees. Some non-tribal casinos have begun and will continue to develop throughout Kansas in recent years and beyond – those casinos will be governed by Kansas laws and licensees should be aware of any signage restricting their firearms access into the casino.