sounds off to boot. how new is this gun?
you can always give a shot at a soft rag under pliers with a push downward to get enough pressure.
i do have that model here. if you dont have any luck or a better suggestion send me a message. i will jump on webcam and strip/reassemble mine with you to see whats going on.
more than likely someone else will have encountered this and know off the bat.
THE SILENT TYPE