50% of guns sold in TX do not get a background check.

[Amishman]

7. Kind of, Texas does not do a separate background check for the sale if they already have a license

Did a search from seeing this topic and found this (warning gunner site) https://onlinetexasltc.com/background-checks-for-texas-handgun-purchases/

Anyone who holds a current and valid Texas License to Carry is exempt from having a background check completed, even when purchasing at a federally licensed gun dealer.

So they don't do a background check at the time of sale if the buyer has an active Texas gun license, because a check was done when that license was issued.