The following is from http://www.packing.org/state/oklahoma
Car/Gun law summary
Date updated: Aug 23, 2005 @ 9:58 pm
§21-1289.13
Transporting A Loaded Firearm
Except as otherwise provided by the provisions of the Oklahoma Self- Defense Act or another provision of law, it shall be unlawful to transport a loaded pistol, rifle or shotgun in a landborne motor vehicle over a public highway or roadway. However, a rifle or shotgun may be transported clip or magazine loaded and not chamber loaded when transported in an exterior locked compartment of the vehicle or trunk of the vehicle or in the interior compartment of the vehicle notwithstanding the provisions of Section 1289.7 of this title when the person is in possession of a valid handgun license pursuant to the Oklahoma Self-Defense Act.
Any person convicted of a violation of this section shall be punished as provided in Section 1289.15 of this title.
Any person who is the operator of a vehicle or is a passenger in any vehicle wherein another person who is licensed pursuant to the Oklahoma Self-Defense Act to carry a concealed handgun and is carrying a concealed handgun or has concealed a handgun or rifle or shotgun in such vehicle shall not be deemed in violation of the provisions of this section provided the licensee is in or near the vehicle.
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Where do you carry your "magazine" in a SUV which doesn't have a "exterior locked compartment"?
I've just kept my AR or other rifle, unloaded in the back seat (out of reach), with the unloaded magazines and ammunition in the far back of my SUV. Don't think this meets the letter of the law but what else could I do?