The GHK 40rd GMAG Gas Magazine has a Polymer external housing with metal internals containing a high-flow output valve. Since it was made specifically for the G5 / M4 Gas Blow Back Rifle series, it only stores 40 round 6mm BBs which is quite a lot for a GBB mag and a slot where you insert green gas.
VFC 30rds V Mag for Umarex / VFC HK416 / VFC M4 GBBR Series
VFC have been producing HK416 and M4 GBBR series for a long time, but for the longest time people have been looking for a polymer light weight magazine for the Umarex/ VFC HK416/ M4 GBB platform, now VFC have just introduced us the VMAG, which provides great gas efficiency, same magazine capacity as the real gun magazines yet remaining lightweight. Fit for all Umarex HK416 GBBR/ VFC M4 GBBR platform.
Umarex (VFC) 30rds Magazine for Umarex HK416 / AR GBBR (Version 2)
30 round gas version 2 magazine for the VFC system gas blow back M4; fits the SOCOM Gear Gas M4. This version is more reliable and will go through more BBs and less cooldown if you do decide to go crazy in full auto. The steel housing adds good weight, realistic feel and not only resistance to wear but eventual wear and tear will add a real environment-on-steel worn look.
Prowin '30rd EVO' 50rds Gas Magzines for Tokyo Marui M4 MWS / WA M4 GBBR Series
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50 round capacity.
Improved gas efficiency.
Tokyo Marui MWS system GBBR.
Tokyo Marui Type 89 J.G.S.D.F GBBR.
Western Arms (WA) System M4 GBBR.
With an extremely prolific background, Prowin has been one of those names in the airsoft industry that is easily recognizable. Producing everything from their industry leading hop-up chambers to highly efficient gas magazines, when you see Prowin, you know you are in good hands.