I have built an BREN L4A3. When the lower receiver is removed from the upper receiver, the trigger works smoothly in both semi auto and full auto. With everything assembled, I can easily pull the trigger and release the bolt in semiauto. If I switch the selector to full auto, the trigger locks up and can't be pulled. Sometimes, if I squeeze the trigger again (or a couple of times) the bolt will release. Any ideas as to what might cause this?
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