Yes, it is not legal to sell any gun, whether a long gun or handgun, to someone who you KNOW is from out of state.
Like GTG said, it's illegal to sell a gun to someone who is not a resident of Oklahoma without going through an FFL. With a DL I know that they are a resident. I was thinking that this only applies to handguns, does it apply to long guns as well?
Now if you have some specific reason to think that they are from another state, it would be legally prudent to ask them, just to make sure.
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