State ex rel. Taylor v. Anderson, 242 SW2d 66 (1951). The State Park Board is a state agency, expressly given the power to make and promulgate all rules and regulations as it may deem necessary for the proper maintenance, improvement, acquisition and preservation of all state parks. Therefore, letter granting defendant permission to operate sight-seeing boat tours within state park, written 10 years prior, could constitute no more than a bare license, or permit, subject to withdrawal or cancellation at the pleasure of the State Park Board.
Yes, they're fairly insane when it comes to OC (obsessive-compulsive).DNR is not a political subdivision, but a state agency. http://revisor.mo.gov/main/OneSection.aspx?section=21.750&bid=455&hl=
Their youtube video (at the 1:46 mark) states OC and CC are prohibited.
The state can, as it sees fit, regulate the carry of firearms on "their" property. Removing the RSMo 21.750.3 language that enables the regulation of OC via permit in some jurisdictions is a higher priority than the OC/CC prohibition at the August A. Busch gun range.
ETA: DNR can implement regulations per RSMo 536.024. Missouri Code of State Regulations, Title 10, Division 90.