The Modify Air Seal Nozzle for M4 or M16 fits any brand M4/M16 AEG, including Classic Army M15A4, Echo1, and others. The o-ring seal provides increased efficiency in any M16 style airsoft rifle.
This air nozzle replaces a leaky or inefficient original air nozzle on any airsoft M4. This part works best when paired with a Modify cylinder head for best performance. Replacing a leaky air nozzle can improve performance by 20-50fps.
Note: This is a standard size air nozzle, not a bore-up.