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Honestly...don't know in your setup.
Some makes/models of nozzles seal better with either (or both) the cylinder head nozzle and hopup unit/rubber lips.
If you look closely at a bunch of different M4 series nozzles, you'll note some are angular, come are virtually squared off, others are rounded. Some have an o-ring inside to seal with the cylinder head...some don't...some have 2. Some are plastic, some are metal. Then there's the whole debate as to cross cross-section or plain round cross section.
Regardless of the one you go with...you want it to seal well (or perfectly) with the cylinder head nozzle, but still move freely/easily...and you want it to fit the hopup unit as tightly as possible, but still move freely...and you want the tip of it to seal perfectly with the hopup rubber rim.
So if the compression in the mechbox is great...that's all you can readily test. There are some tests that you can do to see if the nozzle is sealing well with the hopup rubber...but I've not found them very easy/sure to do myself (I'm probably doing it wrong).
Best of luck,
Tys
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