The ULT was designed to prevent runaway using a normal setup. With a standard 850psi input and only 1 shim in the ULT, the trigger pull should be light without any runaway at all. What is the velocity of each shot as it is firing at 19bps. Is there drop-off or is the velocity constant?
Originally Posted by maniacmechanic
Something is out of whack. Check the ULT top orings, bolt lip, and sear to start. If you can get another bottle, try it just to rule out a higher than expected output.
Except for the Automag in front, its usually the man behind the equipment that counts.