This magazine works fine. Below was a review about how the magazine would unwind and cease functioning when the reservior got low....that is how ALL hi-cap magazines work, save the TM FAMAS magazine (and a few older models). The only problem I had was a small piece of wiring inside the magazine coming loose, and eventually causing the magazine to cease functioning. But I have three of these magazines and that was the only one with this problem.
Feeds all but 30 BBs
Easy to paint
Trap Door comes open very easily, making running and climbing more of a task due to the fact that you must check to see if your spare magazine door has opened to spill all of your ammo
Possibility that Internal parts not at a very reliable standard
Rating: [4 of 5 Stars!]