Your right its not the only thing. For some though an OK DL is only thing that says they are a resident of Oklahoma. I doubt a water bill, gas bill, or something along those lines means your not a BG. I believe some states water bill, gas bill don't prove state residency anyway.Proof of residence does not necessarily have to be a state ID, water bill, gas bill or something along that lines works. I did not read in OP's statement that he wanted a photo copy of a state ID. I took it as he just wanted a little extra proof that he was doing his part to keep guns out of BG's hands.