Capacity of the P90 magazine is not too high and it's worse with their functionality. A solution could be this reduction. Fits in place of the existing magazine. Customer then can use classic high-capacity M4 series magazine. You can use any common brands. Filling of the magazine is with top window. Capacity is about 1500 BBs. M4 magazine remain in the device and loading is standard wheel turning. So you can have only one magazine. Made of durable plastic with a metal base.