WE second generation M4 Department GBB magazine-Kit, can fit on the first generation of the magazine housing. After the replacement of the second generation of M4 Department GBB magazine-Kit, can be used for M4/m16/SCAR/L85/PDW GBB. WE second generation M4 Department GBB magazine with a good approximation to the the G36 and AK mags structure of gasification effect.