CYMA CGS D500 Drum Mag Gas/HPA Magazine For Marui / CGS MWS M4 GBB
 
Metal &  Polymer Constructed Magazine Body
Steel valve and knocker, 70 Degree gas route seal
Auto / Sound Control Feeding 
Electric Loading 9V Battery (  Battery Not Included )
500 Rounds 6mm BB approx.
Green Gas Operated Magazine 
Compatible With Marui MWS AR / M4 GBBR Series
Compatible With CYMA CGS GBBR Series or similar spec
CYMA : MWS-D500