At Smith, ye I knew it would vent if barrel was not attched because of that. Just thought it was weird tho that it would fire that shot without the barrel (dry fire obviosly) but pulling the trigger does nothing at all with the barrel installed.
Echo, you are correct both times. It only vents with the barrel off if I pull the trigger, otherwise it is sealed nicely. And yes, that is the spring I am missing, #13. Not sure how I lost it lol.