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The KWA RM4A1 ERG is the newest offering from KWA. This rifle features the new 3GX gearbox that allows for its electronic recoil system, similar to the SOPMODs from Tokyo Marui, and the type of velocity you'd expect from KWA. The RM4A1 has an amazing feel as a very solid metal M4. The new magazine has a capacity that can be changed to hold either 30 or 60 rounds. This new magazine also features an extended follower that prevents the rifle from firing when the magazine is empty. This feature only works with the ERG magazines. The RM4A1 does accept standard M4 AEG magazines as well.Note: Does not include battery or charger