Umarex 850 Won't Fire

I have a Hammerli Umarex 850. I was having trouble chambering a round and ended up taking the bolt housing apart and found a pellet had found its way into the housing and was blocking the bolt from fully chambering a round. Once I put it back together it will not fire. Pulling back the bolt will set the safety but when I release the safety the trigger will pull but not fire. What stupid thing could I have done or forgot to put back into place??
 
the good news is there are many posts that show the gut of this rifle
and what you did is unknown by any of us we were not there
there is one thing that is certain you are going to open it back up and fix it
hammerli 850.jpg