[Eastwoods]

Hey folks, I recently acquired a used tippmann m4 on the classified section here.

The previous owner mentioned an issue with full auto not working properly but semi was fine.

Only internal mods are a tdc mod and a pdi barrel.

Now when I plug in the hose and open the valve, the line fills up. If I try to shot, nothing happens. If I pull the charging handle and release it, it starts shooting full auto without pulling the trigger and wont stop until I shut the air flow....

Any one can help or point what i'm doing wrong?

Any help will be much appreciated