The mechanics inside are designed in a way that the carrier is linked to the movement of the bolt. If the bolt isn't in the completely closed position, the carrier is out of alignment also. I found that out when shells wouldn't load. I moved the bolt and slammed it just a little. Shells went right in.
I hear people talking about the Benelli click. It's all related. All those parts in the trigger group work off of each other. If you're careless in closing the bolt, everything gets messed up.
Like I said, you don't need to slam it from an open bolt, but you DO need to let it travel enough to lock up the bolt. Usually an 1 1/2" to 2" will do it. If you look closely, you can see if the bolt is locked up or not...