Steel M4/M16 30/130rds Variable-Cap Magazine [Arcturus]

30-Round Real-Cap 135-Round Mid-Cap mode switchable. One button easy switch from mid-cap to real magazine capacity. One piece magazine shell providing more durability. Made of fiber reinforced polymer. Applied with high strength material providing high-quality external texture. Special design of follower makes sure no BB left after the final shot. Compatible with most AEG at the market, including Arcturus, Ares, Cyma, APS, GG, EL etc.