Make no mistake about it, police hate it when they find guns on people. Lets face it, cops get killed all the time in the line of duty, and its usually during a routine traffic stop.
If the police find a gun on you their attitude may turn south.
Once you have intimated the cops by merely being found to be in possession of a firearm, expect to be charged with all sorts of criminal offenses including anything they can come up.
If you are arrested and caught with a firearm or other weapon deemed illegal by the State of Texas, talk with an attorney about the case and see they can get it thrown out of court.