That was made official in 2021; more recently:
Texas Sen. Bryan Hughes, R-Mineola, [has] authored a resolution to make the cannon the official state gun of Texas. On April 10, the resolution passed the Senate with a 28-2 vote.
Official gun, rather than handgun, which, again, Texas already has.
And most recently, Texas Sen. Vergil “Rip” McCoy, R-Beaver Creek, authored a resolution to make the GBU-43/B Massive Ordnance Air Blast the state’s official large-yield bomb.