A shuttered adapter is described that includes a shuttered housing, a shutter sub-assembly frame contained within the housing, a pair of shutter doors hingedly secured to the shutter sub-assembly frame, and a door spring configured to push the shutter doors outward from the shutter sub-assembly frame and away from each other. The shuttered housing can have a separable sleeve retention insert which allows a ledge to be molded inside the shuttered housing. The ledge can be configured to abut the front lower surface of the shuttered doors when the doors are pushed outward from the shutter sub-assembly frame.