X valve problem -- need help please

[ol'butdeadly]

I bought a ule xvalve mag. It shot fine. I put a ult in it. It shot fine. I decided I wanted to sell it so I put the stock parts back in and now it double fires with every trigger pull and full auto if I hold the trigger. I've tried to tune the lvl x and all that. This one has me stumped. If I put the ult back in it works fine. Any suggestions?

Thanks in advance

Nevermind, fixed it!!

[Tym]

What was it? It's nice to post fixes for other users that may have the same problem.