TexasCHLforum.com

The last 3 guns I've purchased (all in 2015) I had to show a TX DL to prove residency. All the CHL got me was not having to have the background check done on 2 of the purchases. One dealer, the base in FTW, called the background check in despite my CHL. The CHL also has my TX DL # on it. If you don't have a TX DL I'm curious if your OK DL number is on your CHL? That would be a flag to a dealer that you aren't a TX resident.

From your post that your family is stationed in TX while your wife finishes her career, I assume she is military and thats how you get to keep your OK residency? If thats the case, you should be able to claim TX residency to purchase a firearm. The dealer may want some additional documentation such as copy of ID card and orders. From the instructions on ATF 4473:

"Question 13. State of Residence: The State in which an individual resides. An individual resides in a State if he or she is present in a State with the intention of making a home in that State. If an individual is a member of the Armed Forces on active duty, his or her State of residence also is the State in which his or her permanent duty station is located."

If she isn't military or attending a state college/university you have to register vehicles in TX and get TX DL.

http://www.txdmv.gov/motorists/new-to-texas

Good luck and thanks for your service!