I am new to the group so bear with me please. I have been working on a FN commercial Mauser I picked up and bought one of those sleek replacement shrouds. It was sort of rough when I received it but it finished quite nice. I reassembled the bolt and put it in the receiver and it seemed to function until I went to fire it. When I pulled the trigger there was no boom. I checked the primer and it seems the firing pin is not making contact with the primer. I've been comparing the original shroud with the new one and I am not seeing it. Any help or direction would be appreciated.