FPS Softair Polymer Air Nozzle with Inner O-Ring for M4/M16

Increase your electric M4/M16s power and air efficiency with an upgraded nozzle and O-ring. With its robust CNC Delrin construction, this will make a great enhancement over your stock nozzle and is to be used with version 2 gearboxes. Make sure to use pure silicone oil to lubricate your cylinder head's nozzle stem before installing this nozzle.