Texan valve rebuild

Be careful... I don't exactly know how the valve works but if you shoot it too many times it will come apart with the pieces rolling around in the bottle. Some more experienced members may chime in with a better explanation. You can change the o ring behind the top hat without taking the valve apart. It will slip over. My 50 Texan eats a a few of those o ring s up. I don't know if you can crack the pressure gauge loose slowly and realize the air. Hopefully you get more help here on the forum.
 
Losen the pressure gauge (roughly 1/4 turn) until it seeps and wait.
Dry firing it will, as RM say, smack the valve to bits.

What do you want to do to the trigger???
I can tear into mine and snap pics if this will help you.
But if you're looking for a hair trigger you are sadly mistaken, the innards are crudely made and there is nothing to gain.
Only omitting the safety auto reset is worth working on in there.
 
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Thanks One thing I forgot to ad is the hammer spring adjustment. There is a thick tar like grease that is used to quiet the spring. I put some on the threads to make a little resistance ,polished the ends of the spring and hammer. Now it doesn't float around and no longer feels like junk. Just polishing the end of the springs in any gun will improve it.