tm m4a1 mws zet systems gbbrExcellent Quality and Weight: When you first hold the Tokyo Marui M4 GBBR in your hands, you will immediately notice its solid construction. It is heavy and sturdy, giving it an authentic feel that can rival other high end models. The beautiful cerakote finish gives the receiver a fine texture and a clean, polished look that will stand out on the battlefield. Advanced ZET System: Tokyo Marui has taken the time to perfect this rifle, and their focus