The Echo1 M4 Drum Mag is a Beta C-MAG style mox magazine designed for airsoft M4s. For those that find that hicaps are too small, the C-MAG is the big boy on the block. These auto-winding drum mags are battery operated and sound activated. This not only eliminates winding, but also means that you no longer have to manually control the boxmag. When you fire the gun, the sound of the AEG activates the magazine and winds it as you shoot.
Echo1 uses a rechargeable internal battery to power the C-Mag motor, and includes a wall charger to recharge the unit.
-Fits all brand M4 AEGs
-2800 Round Capacity
-Internal Rechargeable Battery