Yes, you can carry a firearm in your car without a permit or license. The gun has to be unloaded with no clips in it, and the ammo has to be in another part of the car. You can not access both at the same time. same goes for that shotgun or rifle in the back window. It has to be unloaded. anyone can transport those kind of guns. But, if you want to carry one on your person, you have to have a CC permit.
Here in Oklahoma, they are trying to pass the open carry laws. I have pro's and cons about this. I open carry all the time at work, but when I'm not at the base, I always have my .45 on my hip under my shirt. It would be a lot better if I had better access to it in a bad situation. But then again, it would be a LOT easier for the bad guy to take that gun from someone that doesn't know how to protect it. And just think of the gang problems if they could open carry . It would be the wild west all over again. It's a double edged sword. either you never know who is carrying, or it's there for the taking.