I was shooting my Striker today and the safety became stuck in fire. Upon closing the bolt after this the gun would fire upon closing. Took it home and removed a black piece of stuff/foriegn object from safety area. The safety will now work only when the bolt is open. When the bolt is closed the safety will not work. I am concerned with the firing upon closing which has stopped after cleaning, but I am not sure if something broke inside or not. My other Striker still allows the safety to be placed on when the bolt is closed. I also took off the trigger arms the other day to install a single shot follower. Not sure if this is related or not because I fired 40 rounds before the safety stuck.

Any ideas??