It would seem that the NRA (and the locally recognized affiliate thereof) consider Oklahoma to be utterly unworthy of their time. Once I realized this, I began to consider them to be utterly unworthy of any further membership dues.
I think it's more a question of priorities, They know Oklahoma in general is pretty solidly in their camp. They're time and efforts are needed in much more liberal, gun grabbing areas of the country. Doesn't make it much more palatable to us, but I'm sure they have allocale their resources were they are most needed.