Matrix 1500rd Box Magazine for FN P90 AEGs LiPo High Voltage Batteries 25mm nozzle length Fully compatible 25mm nozzle length Fully compatible with most aftermarket soft and hard rubber buckings without losing FPS or dropping BB during use Wisely equipped with an interchangeable Inlet Adaptor OD11mm to ensure the hopup unit is inserted exactly in the center of the 11mm inner bore AEG Gearbox HPA Engine nozzle outlet without wobbling The Acetech Raider Tracer Unit (Blaster M Inside) is for use on airsoft guns that have a 14mm threaded (for use on 14mm CCW or 11mm CW w included adapter) barrel Easy installation Supplemented by a high capacity M4 M16 magazine (not included) allows for even more bbs to be fed into the reservoir