Or the trigger pin may be threaded out too far. AGD's tech manuals usually say that when gassed up, the trigger pin should be ~1/16" from the trigger when it's all the way forward (stick a 1/16" allen wrench in there to check), and when the trigger is pulled, the trigger should stop ~1/16" from the back of the frame.
I'm really not good at writing signatures. I mean, what is it that you're really trying to do? Write something that somebody's actually going to remember, or even read? Yeah right! Nobody ever actually reads these things.