AMOEBA M4 AEG Series is dedicated to fulfill the needs and demands of war game players from different age and genders, by combining the best materials and the most advanced technology together to deliver an outstanding performance of shooting in the field. Every shooters are able to experience the unique look and feel, also to appreciate the tactical features of the AMOEBA M4, including nylon fiber upper and lower receivers, aluminum outer barrel and 6.03 inner barrel, adjustable buttstock (certain models), CNC 6063 handguard and silencer, Rapid Velocity Tuning System – RVTSTM and advanced Electronic Firing Control System – EFCS (All AEG models)