Texas Attorney General Paxton Opinion No. KP-0296: Texas Local Government Code prohibit municipalities and counties from adopting regulations related to the transfer of and commerce in firearms, and that these emergency stay-at-home or shelter-in-place orders may not regulate or restrict the sale of firearms.

https://www.texasattorneygeneral.gov/sites/default/files/opinion-files/opinion/2020/kp-0296.pdf