A fiber optic connector assembly comprising: a connector housing defining a locking portion defined on an outer surface of the connector housing; an adapter assembly selectively coupled to the connector housing, the adapter assembly comprising: a conversion housing extending around the connector housing and defining a conversion front end and a conversion retention member that is positionable between an engaged position, in which the conversion retention member restricts movement of the connector housing with respect to the adapter assembly in an axial direction, and a disengaged position, in which the connector housing is movable with respect to the adapter assembly in the axial direction; and a release housing positioned between the conversion housing and the connector housing, the release housing defining a release front end positionable at least partially within the conversion housing, and a release face selectively engageable with the conversion retention member and configured to move the conversion retention member from the engaged position to the disengaged position; and wherein the locking portion has a limited width-wise extend along the outer surface of the connector housing in the circumferential direction; characterised in that the conversion retention member defines a rearwardly-facing ramp opposite a forwardly-facing connector engagement face that is structurally configured to engage an engagement face of the connector housing. a connector housing defining a locking portion defined on an outer surface of the connector housing; an adapter assembly selectively coupled to the connector housing, the adapter assembly comprising: a conversion housing extending around the connector housing and defining a conversion front end and a conversion retention member that is positionable between an engaged position, in which the conversion retention member restricts movement of the connector housing with respect to the adapter assembly in an axial direction, and a disengaged position, in which the connector housing is movable with respect to the adapter assembly in the axial direction; and a release housing positioned between the conversion housing and the connector housing, the release housing defining a release front end positionable at least partially within the conversion housing, and a release face selectively engageable with the conversion retention member and configured to move the conversion retention member from the engaged position to the disengaged position; and a conversion housing extending around the connector housing and defining a conversion front end and a conversion retention member that is positionable between an engaged position, in which the conversion retention member restricts movement of the connector housing with respect to the adapter assembly in an axial direction, and a disengaged position, in which the connector housing is movable with respect to the adapter assembly in the axial direction; and a release housing positioned between the conversion housing and the connector housing, the release housing defining a release front end positionable at least partially within the conversion housing, and a release face selectively engageable with the conversion retention member and configured to move the conversion retention member from the engaged position to the disengaged position; and wherein the locking portion has a limited width-wise extend along the outer surface of the connector housing in the circumferential direction; characterised in that the conversion retention member defines a rearwardly-facing ramp opposite a forwardly-facing connector engagement face that is structurally configured to engage an engagement face of the connector housing.