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.