For cylinder conversion systems Polastar assigns numbers to the
nozzles instead of using the rifle model.
This is because the nozzle length can vary between the same
gun model when made by different manufacturers.
This can be from the manufacturer designing the rifle differently,
or from the thickness of the gearbox shell affecting how far from
the hop-up chamber the cylinder sits.
Therefore one nozzle length may work in different rifle models
but not necessarily work in the same model from a different
manufacture.
For example, a standard MP5 could require any of 4 different
nozzle lengths depending on the manufacturer.
For this reason Polarstar produces numerous different nozzle
lengths to provide compatibility for a wide range of replicas.
Once you determine what number nozzle your replica requires,
that number is universal across all engines* that use the
numbered nozzle system.
So, if you determine your replica takes a #11 JACK nozzle, then
it will also take a #11 Kythera or F2 nozzle if you ever put a
different system into it.
NOTE:
The Kythera models which are made for a specific rifle
(e.g. A&K/JG SR-25) with a non-standard length cylinder will use
a specific nozzle with a "K" prefix.
Since they use a non-standard cylinder, the universal numbing
system cannot be used for these models. However, the design
and profile of the "K" nozzles are the same as the standard
numbered nozzles and are cross compatible between standard
and non-standard cylinders.
Additionally, all nozzles are marked with their number with the
exception of the #1 nozzle.
These are produced in far greater quantities than all of the other
nozzles so they are left unmarked to reduce production time.
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