You all can call BS all you want but that is exactly what happened. The hammer was not cocked and the trigger was not pulled. We could not even push the firing pin back in the hole to get a screwdriver on the part that holds it in. Had to hammer it back. It was stuck completely out. When the breach was closed (its a break action) the firing pin contacted the primer just as it would if the hammer hit it.

I'm not going to argue about what I know is true. I just wanted to make others aware of what can happen if you don't clean the firing pin when you clean the rest of the gun. Thanks for your input.