A surgical instrument apparatus including an elongate tubular body having a proximal end and a distal end and a bore extending through the tubular body is disclosed. The apparatus includes an actuator link extending through the bore and operably configured to move longitudinally and having a first end connected to an actuator at the proximal end of the tubular body and a second end terminating in a coupler. The actuator is operably configured to cause the actuator link to selectively move between an extended state in which the coupler extends beyond the distal end of the tubular body to permit an end effector to be coupled to the coupler, and a retracted state in which the coupler is retracted back into the distal end of the tubular body for operation of the surgical instrument. A removable end effector apparatus for the surgical instrument is also disclosed and includes an end effector body, and at least one moveable jaw mounted within the end effector body, the moveable jaw being operably configured to receive and connect to a coupler on a distal end of an actuator link of the surgical instrument when extended beyond a distal end of a tubular body of the surgical instrument. When the actuator link is retracted back into the distal end of the tubular body, the at least one moveable jaw is operably configured to move in response to pushing and pulling movements of the actuator link.
