The geddon Arm and main reg body are rated for 4.5k use basically the only possible difference is that it will have a burst disc rated for 3000psi, so yes you can change the bottle from a 3000psi bottle for a 4.5k one, just change the burst discs (one on the bottom of the reg body and the one on the arm) at the same time.
Well lets put it this way mine came with a 3000psi bottle on it and i changed it to a 4.5k. . . no problems!
Steve
Well lets put it this way mine came with a 3000psi bottle on it and i changed it to a 4.5k. . . no problems!
Steve