MAXX Model Airsoft CNC Aluminum Hop Up Chamber AEG Series M4i PRO (Gray) suppressor SPECIFICATIONSMANUFACTURE: WELLMATERIAL: ALUMINUM OUTER BARREL PTS SPECIFICATIONSMANUFACTURE: WELLMATERIAL: ALUMINUM OUTER BARREL Length: 46 5mm are sold separately) Mounted the removable CNC Brass Side Wings to slide smoothly into the outer barrel slots Included an advanced CNC Delrin Locking C Clip to hold the inner barrel tight in place without wobbling and twisting Equipped with 2 compression springs on top and center to ensure the hopup unit is seated straight and air tight during use Specially designed with a new BB Latching System to prevent BB dropping after removing the magazine The Latching Arm can also be manually pressed to release the remaining BB from inside the hopup chamber Compatible with any 12mm inner bore ICS AEG Gearbox nozzle outlets The Dual UV LED Tracer Module to glow BB in the dark ready 5mm are optional)