M249 SAW if you can find em. Not many in civilian market. They are upward of $20-30k last I looked. Around the same price for an M60E2. Cheapest way to start off with full auto is a MAC10/11. A guy I shoot with got one for around $1500. There are sub gun shoots here in TX as well so you can use them for competitions. Although living in Dallas county, good luck getting the sherriff to sign off on your paperwork. Best county for that is Denton. They actually have a dept. that does all the initial background checks. If you have a CHL, much easier.
You can have a concealed carry license here in TX. Providing again you pass a background check and handgun proficiency exam and written exam on laws. Prior military never has a problem with this.
Oh you betcha. They exiled my Moderate Republican, Catholic, Guntoting NRA a$$ outta there. I was into martial arts and guns. By CA standards I am considered a "violent individual"