Cyma 2500rds Electric drum for AK

I can't review how well this magazine works because I have not used it yet. But I want to give people a little warning because this magazine does not come with instructions. The battery chamber cover comes on and off easily enough without any troubles but on the BB side there is a little piece of screw molded in the plastic. Old school drums you can just open and pour in the BBs, not a good idea with this one. It was really annoying to try to make it fit back together so I unscrewed it to make it easier to get the cover back and sure it does but now it's kind of floppy and doesn't fit that well. The little screw piece does not have a head so getting it back will be more of a struggle than I would care for I will just go to town and and get a tiny little screw and fasten it from the outside, should do the trick. To wrap this up think of this magazine like a electric ultra high-cap rather than a old school drum, I think you should fill it through the latch and hold the BB pusher thing back with your finger and don't open the bb chamber at all this magazine does not work like the old drums and you won't see the little screw piece unless you know it's there and you look for it. So maybe put a little warning in the description. It will probably work just fine when I put a screw in but this is how you find out by fucking around and just letting you know how to not do it. ????