you can get a reg w/solenoid for $115 and 5lb tank for like $58
that's just a bit more than the redsea kit, and you will save on refills in the long run
filling 20oz at outdoor places here costs the same as filling a 5lb at welding supply, obviously it may be different where you are, but its something to think about, since 5lb will last a lot longer than 20oz.
I have the redsea regulator/needle valve, and I would advise against getting it, if you want to go paintball, buy a good reg and get some adapters imo
even then it may be cheaper to just get a 5lb tank and no adapters