You are allowed to O.C. Inside your car as long as your weapon is clearly visible to the Officers should you get stopped. If I remember correctly, your car is an extension of your home under Missouri Castle Doctrine law. So, therefore it is legal for you to have your firearm with you while in the car. You CANNOT however have your hand anywhere near your weapon while in view of officers, again should you be stopped by Missouri Police. Should you be stopped and your weapon is hidden somewhere in the vehicle, you do not have to inform the Police that you are carrying unless they opt to search the vehicle only if they have probable cause.
I agree it is a poorly written question, being that there is no punctuation or grammar. On the other hand, it does seem like a fairly straight froward question. I would easily assume from the context that he is not asking about the states of Nevada and Missouri, but more so that he is asking about the town of Nevada, Missouri. In this case, his question regarding OC in Missouri is that is is legal, but the town of Nevada, MO may regulate it. Looking at their
firearms ordinances online:
"Sec. 23-27. - Same—Carrying while loaded prohibited.
No person shall carry, transport or have in possession any gun, revolver, pistol, shotgun, rifle or other firearm, loaded with any explosive and bullet, shot or other projectile, on the public streets, alleys or other public thoroughfares, nor in or upon publicly owned land in the city; provided, that nothing in this section shall apply to those persons set out in subsections (c) and (e) of section 23-26. No person shall refuse to permit any police officer from inspecting any such firearm to determine if the same is so loaded.
(a)This provision does not apply to lawful conduct authorized under state statutes found in RSMo ch. 571.
(b)No interpretation of this ordinance inconsistent with the provisions and exceptions of RSMo ch. 571. And judicial decisions interpreting the same are intended or permitted."
It would appear the the town of Nevada, MO forbids OC, since the state only permits municipalities to regulate it. There is, however, an exemption called the Peaceable Journey law which permits you, at the state level, to carry in your vehicle, however you want. It can be loaded, open, concealed upon you, concealed in your vehicle, however you choose.
Now, it according to 23-27, it states that the gun cannot be loaded. It appears that it would be legal to do UOC (Unloaded Open Carry), where the gun is completely unloaded (no loaded mag, no loaded chamber) and you carry a magazine in your pocket or in a mag pouch. (Basically what California used to have.)
The same section also states this rule only applies to public places. Therefore, OC on your property, or any other private property with the owners permission is allowable, and it could be loaded in these places.
(Keep in mind, I am not a lawyer, and you are solely responsible for conducting yourself in a legal manner. If you want to know for sure, hire a lawyer.)