This is how rap4 has kept the price of the mags down
As you can see from the video that the mag has two "tubes" that you load with paint, after you fire one tube you flip the mag over and fire the other half. It may keep the price down but it takes away from the realism of a mag fed marker.
I feel they might work for a sniper role lets say because now you don't have everyone firing the same 20rd mags but I don't think this is what everyone has been expecting for the last few months
Will this design work for them? I guess we will just have to wait and see.