Silverback 90 Newton mainspring for SRS & TAC-41 replicas

Description Silverback 90 Newton mainspring for SRS & TAC-41 replicas This spring is compatible with the “APS 13 mm” standard (9mm spring guide) – it has been designed for SRS replicas (except Push-Bolt mechanism) and all TAC-41 replicas and features a black coating and laser markings for easy identification.