PolarStar Kythera M3 Orifice Screw – 0.015″
The PolarStar Kythera M3 Orifice Screw in 0.015″ is an airflow metering component for the PolarStar Kythera HPA engine. The M3 Orifice Screw is a precision-drilled screw that controls the volume of air released per shot by restricting airflow through the engine’s internal path — the orifice diameter is the primary velocity tuning variable in the Kythera engine. The 0.015″ orifice is the smaller of the commonly available Kythera orifice diameters — restricting more air than the .029″ variant, and producing a lower velocity output at the same input pressure. This makes the 0.015″ orifice the correct choice when tuning the Kythera to lower velocity limits, or when reducing from a currently-too-high velocity setting.
For Kythera operators who need to reduce velocity output to meet a site limit or to tune for a specific BB weight, swapping to the 0.015″ orifice screw is the correct velocity-reduction step for the Kythera platform.
- PolarStar Kythera M3 Orifice Screw — 0.015″ diameter
- Smaller orifice — lower air volume per shot, lower velocity output
- Airflow control component for PolarStar Kythera engine
- Swap between orifice sizes to tune Kythera velocity
- Made by PolarStar Airsoft






