Umarex HK416 Airsoft Green Gas Magazine (30 rounds)(by VFC)

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.