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Product Description
Difference from other versions, that this m4 hop well is 2mm deeper, so you can add o-ring, to stabilize nozzle, shown in icture.
It makes lot of differnce, because due long nozzle, it wobles little bit.
But with this you can better center it.
For Polarstar F2 size is 7x2,5 and for stock nozzle size is 7x2.
Do not forget lubricate.
If you think that you have sticking nozzle, just use small size grind paper and enlarge o-ring inside.
Do not forget to lube.
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