The JBU AK Air Nozzle creates a tighter air seal that ensures greater muzzle velocity when the BB leaves the barrel. The JBU series of upgrade parts are compatible with most major brands of AEG. You can expect the same level of quality from these parts as Guarder and Systema parts for a fraction of the price.
Product was out of spec. The internal bore of the nozzle was too small on mine. Product compares poorly with the other options in its price range.
Rreally smooth internal bore internals will improve seal over the stock air nozzle.
No O-ring. For this price range, you should get an O-ring with an air nozzle. The metal air nozzle is not very necessary, and can be undesirable because if you have a jam, you want your $12 air nozzle to break before your $30-$100 hop up breaks.
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