A co-injection molding system incorporating two or more injection gates feeding a common mold cavity to provide multiple cores surrounded by a skin material within the final finished part. An injection molding system including one or more slug traps disposed along the conveyance path between the injection nozzle and the injection gate and/or at remote portions of the mold cavity to collect and retain vestigial slugs that may form at the injector nozzle and/or at injector gates.
