TexasCHLforum.com

Here is the Texas Penal Code on this topic. (10)  "Short-barrel firearm" means a rifle with a barrel length of less than 16 inches or a shotgun with a barrel length of less than 18 inches, or any weapon made from a shotgun or rifle if, as altered, it has an overall length of less than 26 inches.

It was not made from a shotgun or rifle and has an overall length greater then 26 inches. I don't see anything here that says this would be illegal in Texas. Now the question is legality of carrying since it is not a hand gun nor is it a long gun. It is a Firearm.