Tex. Penal Code 46.01(3)
Texas Penal Code § 46.01. Definitions. 

In this chapter:                                     
. . . 
(3)  "Firearm" means any device designed, made, or adapted to expel a projectile through a barrel by using the energy generated by an explosion or burning substance or any device readily convertible to that use.  Firearm does not include a firearm that may have, as an integral part, a folding knife blade or other characteristics of weapons made illegal by this chapter and that is:    
    (A)  an antique or curio firearm manufactured before 1899;  or             
    (B)  a replica of an antique or curio firearm manufactured before 1899, but only if the replica does not use rim fire or center fire ammunition.
. . . 

Last Amended: 82nd Leg., R.S., ch. 920 , Sec. 1, eff. September 1, 2011
Entered:  July 25, 2011