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Air Nozzles feed rounds into the hop up and channel air from the cylinder through the hop up unit and down the barrel. Most airsoft nozzles are a plastic or aluminum tube with a grooved rear edge to lock into place in the tappet plate. The air nozzle sits over top the front end of the cylinder head and travels back and forth on it, actuated by the tappet plate.
Matrix CNC High Performance Aluminum Air Seal Nozzle for M16/M4