Polarstar Kythera HPA Engine
Price: $288.00 — In stock at 5 retailers.
Prices last checked August 19, 2026 across 4 retailers.
The Polarstar Kythera HPA Engine for airsoft AEGs. Fits in various mechbox styles including V2 (M4, etc), V3, and JG SR-25 style. Achieve 270-500 FPS with simple adjustments. In addition to the engine, you will need a base gun, HPA air tank, line, and regulator. The Kythera has been the most eagerly anticipated products from PolarStar in the past decade. This HPA system is a radical departure from all previous systems that PolarStar has produced since the Kythera does not use a battery, an FCU or any type of electronics. The Kythera is completely mechanical. This means you never have to worry about charging batteries or work with delicate electronics. It also means that the system is completely waterproof. The name "Kythera" (ky-the-ra) was derived from the Antikythera Mechanism which is a mysterious device that was discovered by sponge divers off the coast of the Greek island Antikyther. The mechanism was so advanced in design that scientists have been studying it for decades to discover its purpose. The machine dates from around the end of the 2nd century B.C. and is the most sophisticated mechanism known from the ancient world. Nothing as complex is known for the next thousand years. The Antikythera Mechanism is now understood to be dedicated to astronomical phenomena and operates as a complex mechanical "computer" which tracks the cycles of the Solar System. For this reason we used the name Kythera for the valve mechanism at the core of a new line of PolarStar mechanical HPA systems. Although it contains very few parts and is easy to install and maintain, the system incorporates a very intelligent design and is unlike anything else on the market. The system was designed as a mechanical system from the ground up and uses a realistic trigger mechanism which can be applied to single-shot, semi-automatic and fully-automatic systems. The first of these systems is Kythera SA (Semi-Automatic), the semi-auto-only variant for use in AEG gearboxes. *Please note all warran
Polarstar Kythera HPA Engine price comparison: the lowest price is $288.00 at Airsoft Atlanta, and the median across 5 tracked listings is $288.00.
Compatible with: M4/AR, SR-25, HPA, AEG
Which nozzle fits HPA? Compare fitment & prices →
Where to buy the Polarstar Kythera HPA Engine: prices at 5 retailers
- Airsoft Atlanta: $288.00 — In Stock
- Evike: $288.00 — In Stock
- Airsoft Station: $288.00 — In Stock
- Xtreme Airsoft: $288.00 — In Stock
- Evike: $288.00 — In Stock
Frequently asked questions about the Polarstar Kythera HPA Engine
- How much does the Polarstar Kythera HPA Engine cost?
- The Polarstar Kythera HPA Engine ranges from $288.00 across 4 retailers. The lowest current price is at Airsoft Atlanta. Prices are updated regularly from each store's live catalog.
- Where can I buy the Polarstar Kythera HPA Engine?
- The Polarstar Kythera HPA Engine is currently in stock at 5 retailers including Airsoft Atlanta, Evike, Airsoft Station. We track availability across 4 airsoft stores and update stock status regularly.
- What is the Polarstar Kythera HPA Engine compatible with?
- M4/AR, SR-25, HPA, AEG
- Is the Polarstar Kythera HPA Engine a good hpa engines upgrade?
- The Polarstar Kythera HPA Engine by PolarStar is listed in our HPA Engines category and is priced from $288.00. We aggregate prices from 4 retailers so you can compare and find the best deal. Check the price comparison table above for current pricing from each store.
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