Abstract: A railing, fence or like barrier structure formed from a plurality of lightweight, high-strength plastic or like material components, different ones of which are capable of being either injected molded or extrusion molded wherein the plurality of components are connected to one another and at least some of which incorporate a high-strength material reinforcement member formed on the interior thereof during its molding formation. A connecting assembly or alternately a locking assembly serves to interconnect and/or lock other structural components of the railing assembly to form a structure with a high degree of structural integrity and yet maintain a substantially lightweight construction.