PolarStar Kythera SA Complete O-Ring Set

The PolarStar Kythera SA Complete O-Ring Set is the definitive wear-part replacement pack for your Kythera SA HPA engine. Over time, o-rings compress and degrade, leading to air leaks and inconsistent performance. This genuine PolarStar set restores your gearbox to factory seal integrity in minutes.

Key Features

• Complete set – all seals needed for Kythera SA maintenance
• Buna 70 material – durable, temperature-resistant rubber compound
• Multiple sizes included – rear cylinder, nozzle, spool, and barb fittings
• All versions supported – compatible with every Kythera SA generation
• OEM quality – genuine PolarStar components ensure proper fitment
• Quick replacement – DIY maintenance without gunsmith fees

Real-World Use Cases

Kythera SA users who log heavy field time will notice performance drift after 12–18 months of regular use. Compressed o-rings allow air to bypass the nozzle or spool, reducing muzzle energy stability and trigger response. This set lets you restore consistent FPS and air efficiency without replacing the entire engine. Also essential after storage or if you disassemble for cleaning or upgrades.

What’s Included

• 1× M1.0×16.0 (Buna 70) – Rear Cylinder ID, Front
• 1× M1.0×3.0 (Buna 70) – Barb Fitting
• 1× M1.5×13.0 (Buna 70) – Nozzle OD, Front
• 1× M1.5×15.0 (Buna 70) – Nozzle OD, Rear
• 1× M1.5×20.0 (Buna 70) – Rear Cylinder ID, Rear
• 2× M1.5×4.0 (Buna 70) – Spool Tail
• 2× M1.5×6.0 (Buna 70) – Spool Front
• Additional seals covering all pressure points

Compatibility & Upgrades

This set is engineered specifically for the PolarStar Kythera SA and compatible with all production runs and variants. Keep a spare set on hand if you run multiple Kythera engines or rotate builds seasonally. Pair with PolarStar o-ring grease for smooth assembly and longevity.

UK Legal & Site Notes

O-ring sets are spare parts with no legal restrictions in the UK. They may be checked by site chronographers before play if you’ve recently performed maintenance; have your receipt handy to confirm the work was performed off-site.

Restore your Kythera SA to peak performance. Order the PolarStar Kythera SA Complete O-Ring Set from Airsoftdirect UK today and benefit from next-working-day delivery across the mainland.