Try adding a shim or 2 to the ULT. If you don't have enough shims, you could be short stroking during rapid firing. However, too many shims and you release air into the front chamber before the bolt is full back. This would cause bolt stick. It sounds to me like you could be short stroking.
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Except for the Automag in front, its usually the man behind the equipment that counts. -
I finally called Roman AT AGD and he helped me fix the problem
He first had me go to the yellow spring and i put an extra shim in the ULT. That fixed my level-10ing or coughing problem. Then air was leaking down the barrel, so i went to the smallest carrier with the same oring and VIOLA its FIXED.
I now have a perfectly timed x valve. Gosh, i cannot wait to use it now.
If you need help, Call Roman at AGD, HE'S GREAT!!!!!!!!!!!!
:) 
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Is it just the normal AGD number?Comment
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