I have this box magazine for my classic army m249 SAW
http://www.airsoftmegastore.com/9435...spi-p252p.aspx
I am thinking of getting a SHS motor and 13:1 speed gears which would put my guns rate of fire around 28-30 rounds per second. Before i do this i wanted to know if this box magazine would be able to keep up with that?