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PolarStar Kythera SA V2.5 + Silent Industries ALPHA 2026 · Alignment Kit · SR25 AEG HPA

23,00 €
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Alignment kit designed for SR25 AEG HPA replicas with a V2.5 gearbox and PolarStar Kythera SA V2.5 mechanical engine.

The system uses the Silent Industries ALPHA 2026 hop-up chamber, keeping the Kythera nozzle perfectly centered relative to the chamber. This helps improve feeding consistency, reduce lateral movement, and make more efficient use of the HPA system's pressure.

The PolarStar Kythera is a mechanical HPA engine designed for semi-automatic operation. It does not require a battery, FCU, or electronic components to operate. This version is designed for V2.5 or extended V2 gearboxes used in certain SR25 replicas.

Important: This kit is designed for the Silent Industries ALPHA 2026 chamber. The external geometry of this revision may differ from previous versions of the ALPHA chamber. Compatibility between revisions should not be assumed without checking the dimensions first.

Compatibility

Component Compatibility
HPA Engine PolarStar Kythera SA V2.5
Hop-up Chamber Silent Industries ALPHA 2026
Base Replica SR25 AEG
Gearbox V2.5 / Extended V2
Operation Mechanical HPA, semi-automatic

What the Kit Includes

  • Rear clip for mounting using the rear pin or fixed stock.
  • Alignment base for V2.5 gearbox.
  • Housing for M3 inserts.
  • Side clip for guiding the HPA tube or line.
  • Upper front locking cap for the Silent Industries ALPHA 2026 chamber.
  • Rear plate with mounting point for an M5 screw.
  • Support elements to keep the nozzle, chamber, and inner barrel centered.

Required Components (Not Included)

  • 4× M3 × 4.2 mm inserts
  • 4× M3 × 8 SHCS screws
  • 1× M5 screw
  • 1× M5 washer

The M3 hardware is used to secure the kit base. The M5 screw provides additional support at the rear and improves the rigidity of the assembly.

Gearbox Compatibility and Limitations

SR25 V2.5 gearboxes typically use an extended geometry compared to a standard V2 gearbox. The external shape and nozzle position may vary depending on the replica manufacturer.

Before installation, check:

  • V2.5 gearbox length and position.
  • Nozzle type used by the PolarStar Kythera.
  • Distance between the nozzle and the ALPHA 2026 chamber.
  • Magazine position relative to the chamber.
  • Lower and external body compatibility.
  • Trigger travel and safety system operation.