An HPA Polarstar engine. This model fires only in semi auto mode and is meant to be used in a standard V2 gearbox. This model is unique in that it requires no battery, has no electronic parts in it at all; instead it is entirely a mechanical system. The trigger is meant to be realistic, replicating the feel and weight of a real single action firearm trigger. The trigger can furthermore be adjusted to be fine tuned to user’s preference of trigger weight and over travel.

The design of the Kythera SA completes a shot cycle on the trigger pull. This gives you the proven closed bolt performance of the Fusion Engine and F2 in a completely mechanical, waterproof system with a realistic trigger. It does not require the trigger to be released before the nozzle chambers the next round and the firing volume is refilled. This occurs automatically and consistently every shot, with adjustable nozzle dwell and return speed. As the system resets and recharges immediately after firing, it is ready to fire again before the trigger has been released. This means the system can cycle very quickly for faster follow up shots and a lower potential for double feeding.

The valve design of the Kythera operates without the need for air to control the opening or closing of the valve. Without a pilot valve, 100% of the air going into the system is fired through the nozzle allowing it to operate very efficiently. In addition to being extremely efficient, the system is also extremely consistent. The valve is released at the same point every shot with the same force applied, regardless of trigger input.

The Kythera SA system installs into a standard gearbox as a single assembly and typically does not require any modification to the gearbox. There are no separate parts to install and the only parts needing to be retained from the gearbox is the trigger, spring guide, selector and safety components.

The Kythera has a wide operating pressure range of 60psi to 180psi which allows you to fine tune the velocity of the system and tailor for different requirements and applications. Within this pressure range we observed a muzzle velocity of 270 – 500fps w/ .20g using a 6.05x380mm barrel. This lets a single Kythera be used in any role ranging from CQB to Sniper by mainly just adjusting the input pressure from your air rig.

Specifications

• Manufactured by Polarstar
• Does not use any electronics, completely mechanical
• Fires semi auto only
• Engine for V2 AEG gearbox
• Operating range of 60 to 180 psi

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kythera-V3