I was told yesterday by a licensed electrical contractor that it is a code violation to use the stab lock or screws on a receptacle. That you have to wire nut and pig tail a wire to the device. Citing 300.13B - Device Removal. In multiwire branch circuits, the continuity of a grounded conductor shall not depend on device connections such as lampholders, receptacles, and so forth, where the removal of such devices would interrupt the continuity. Any input would help.