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loves this thread. Dude i just got my we g39 not too long ago, everything was fine until i decided to upgrade the trigger assembly with the ra tech parts. The problem is once i upgraded every part, firing pin, hammer, valve locker etc... the gun only shoots semi auto. I pull back the hammer, on semi and shoot it works. On full auto, when i pull the hammer back, n pull the trigger, the hammer won't release. I put gas into the mag n see if it would shoot, n it fully shoots on full auto. Does anyone know what the problem could be?
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