Air Gun Jams Can you Help

Hi all,
I was working with the airgun today. I put in 1 3/8" brads. It was difficult to slide the piece back in with the brads (which should have been a clue to stop) but I did and then the gun would only fire air, no brads. I can't open the sleeve to remove the brads. Anyone have an idea on how to open it once it is jammed?
Paul tried opening the various parts of the machine but got no where. Any input would be helpful.
Here's a pic of the gun.
Lynn
I was working with the airgun today. I put in 1 3/8" brads. It was difficult to slide the piece back in with the brads (which should have been a clue to stop) but I did and then the gun would only fire air, no brads. I can't open the sleeve to remove the brads. Anyone have an idea on how to open it once it is jammed?
Paul tried opening the various parts of the machine but got no where. Any input would be helpful.
Here's a pic of the gun.
Lynn