DBoys Airsoft M4 & M16 Metal 500rd Extended High Capacity Magazine [Hi-Cap Mag]
For those looking for a bit of an upper hand in the field for their M4 or M16 metal gearbox AEG rifle, we've got the perfect solution.  The all-new DBoys 500-round extended M4/M16 high capacity magazine comes from the factory with a 65% increase in BB capacity. Compatible with metal gearbox M4 and M16 AEGs from AGM, Classic Army, DBoys, Echo 1 and JG.  OEM manufactured by JG, this metallic magazine features durable construction, and an excellent-quality finish.