PolarStar Kythera SA Trigger Link V2 – V2.5

PolarStar Kythera SA Trigger Link V2 – V2.5

The PolarStar Kythera SA Trigger Link V2 – V2.5 provides the correct mechanical connection between the trigger and a PolarStar Kythera SA engine inside compatible Version 2 gearbox platforms. It is ideal for replacing a damaged or missing linkage. Additionally, it can support a Kythera conversion from a V3 gearbox configuration to a suitable V2 build.

PolarStar designed the Kythera SA as a fully mechanical, semi-automatic HPA system. Therefore, the trigger link plays an essential role in transferring trigger movement directly to the engine’s mechanical firing assembly. A correctly fitted linkage helps maintain a positive trigger break, reliable actuation and consistent reset.

Although PolarStar identifies this component as its standard V2 trigger link, the same linkage also serves the company’s V2.5 Kythera configuration. PolarStar pairs its V2.5 engine with the V2 trigger link and the appropriate V2.5-specific nozzle. As a result, the trigger link can suit both standard V2 installations and supported V2.5 or SR-25-style Kythera builds.

The package also includes one 4-40 x 3/8 screw, allowing the linkage to be secured to the Kythera mechanism. However, changing gearbox platforms may also require a different Kythera nozzle. Always confirm the gearbox shell, receiver platform and required nozzle before beginning the conversion.

Whether you are repairing an existing Kythera setup or transferring an engine into another compatible build, this genuine PolarStar component provides the correct linkage geometry for V2-based installations.

Restore, repair or reconfigure your mechanical HPA build with the genuine PolarStar Kythera SA Trigger Link for compatible V2 and V2.5 gearbox platforms.

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What is the PolarStar Kythera SA Trigger Link V2 – V2.5?
It is a mechanical replacement linkage that connects the trigger to a PolarStar Kythera SA HPA engine in compatible V2 and V2.5 gearbox installations.

Does the Kythera V2.5 use a different trigger link?
No. PolarStar’s supported V2.5 Kythera configuration uses the standard V2 trigger link. However, it uses a V2.5-specific nozzle.

Can it convert a V3 Kythera to V2?
Yes. PolarStar states that users can change a Kythera SA from a V3 build to a V2 build by replacing the trigger link and installing the appropriate nozzle.

What screw comes with the trigger link?
The package includes one 4-40 x 3/8 screw.

Does the trigger link require electronics?
No. The PolarStar Kythera SA operates mechanically and does not require an FCU, trigger board or battery.

Is it compatible with every V2 gearbox?
No. Some proprietary or non-standard gearbox shells may require modification or may not support the standard V2 trigger link. PolarStar lists compatibility restrictions for certain Ares and APS gearbox designs.

Check out the Whole PolarStar range here.