I am very happy with this. It feeds well, and it is sturdy (metal and strong plastic). The M4 mag release button works really well (dont know why you would need it though). BB hatch stays closed when you close it. This is the best alternative for the P90 (P90 hicaps are horrable). Only 2 reasons why I rates it a 4 and not 5. One is that the bbs rattle a lot. Basically, it is a giant hopper with free rolling bbs. Second, it doesn't even come with the M4 mag. Overall, I would recomend this magazine to anyone with a P90 who doesn't want to carry arround a bunch of standard 68 cap mags.
holdes a lot of bbs
great mag altogether
doesn't come with M4 mag
not good for heft handed people
Rating: [4 of 5 Stars!]