DMAG ( D-DAY ) M4 350Rds Hi-Cap Wheel EMM AEG Magazine

This is a review from Japan. Compatible with most M4 mechanical box ver.2 electric guns. It could be used for Tokyo Marui, Double Bell, KRYTACS, E & C, ARES.
There is no problem with bullet feeding. The mainspring for bullet feeding is hard, but it is not a big problem.
It's worth more than the price.
I highly recommend it!