Sounds like he was really bored, Sorry you got an a**hole
Sec. 46.01. DEFINITIONS Texas Penal code
(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.
I don't live in Texas but this is what I found online, hope it helps