When dealing with third party replacement of the cylinder head, you need to know if the air nozzle has an inner dimension that allows a smooth fit with the cylinder head nozzle. A loose fitting will fail to seal air, while a tight fitting may lead to air nozzle breakage or jamming. Another thing, is the nozzle of a correct length? A nozzle that is too long can lead to misfeed. On the other hand, one that is too short can lead to FPS drop.
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