Polarstar F2 HPA Engine for Airsoft Rifles (Model: V3 / AK)

PolarStar F2 HPA Engine for V3 AK Gearboxes – Precision Performance in a Compact Powerhouse

Take your airsoft rifle to the next level with the PolarStar F2 HPA Engine for V3 / AK Platforms. Designed for peak performance, incredible air efficiency, and precise control, the F2 is a compact, lightweight powerhouse that delivers the same performance and flexibility as the acclaimed Fusion Engine—just in a cylinder-sized package. Whether you’re building a CQB blaster or a long-range DMR, the F2 gives you full control over every shot.

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Compact Innovation with Elite Engineering

The PolarStar F2 was engineered for players who demand the best in adjustability, durability, and consistency. This drop-in HPA engine for Version 3 gearboxes, such as those found in most AK-style AEGs (especially LCT-type AKs), is built to offer Fusion Engine performance in a lightweight and more compact form.

Its CNC-machined aluminum alloy housing ensures long-term reliability under field conditions, while the design keeps your rifle lightweight and maneuverable.

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Dual Solenoid Advantage – Closed or Open Bolt Firing

At the heart of the F2 lies a patented dual solenoid system. Unlike single-solenoid HPA engines, the F2 allows independent control of the nozzle movement and air volume, which gives you unmatched customization over firing cycles.

This system also enables true closed-bolt firing mode for enhanced first-shot accuracy—ideal for DMR builds—or AEG-style open-bolt mode for high-speed play. You can change the firing behavior on the fly using the FCU with onboard LCD.

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Unmatched Air Efficiency and Velocity Range

Thanks to the new lightweight one-piece poppet valve, the F2 runs at lower pressures and uses less air per shot—increasing both efficiency and air tank longevity.

With an operating pressure range of 45 to 145 PSI, you can dial in your FPS anywhere from 205 FPS to 500 FPS using just one nozzle. No need to swap components for indoor or outdoor play—just adjust pressure and settings and go.

The spring-loaded forward-biased nozzle guarantees consistent loading force regardless of PSI. This ensures smooth feeding even with varied magazines and BB weights.

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Why Choose the PolarStar F2 V3?

• Lightweight and compact design for improved balance and maneuverability

• Drop-in compatible with most V3 gearboxes, especially AK platforms like LCT

• Spring-loaded nozzle provides reliable feeding at any pressure

• Adjustable FPS for CQB to DMR builds

• Dual solenoid design offers precise control over nozzle and valve timing

• LCD FCU (Fire Control Unit) for intuitive tuning

• Built with top-tier American engineering and manufacturing standards

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Specifications

• Model: F2 for V3 / AK

• Operating Pressure: 45 – 145 PSI

• Velocity Range: 205 – 500 FPS (with appropriate tuning)

• Material: Aluminum Alloy

• System: Dual Solenoid, HPA

• Length: 4 inches

• Compatibility: Most Version 3 gearboxes, LCT AK AEGs

• Includes: F2 Engine, FCU, wiring, and required hardware

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Built by PolarStar – Leaders in HPA Innovation

Since 2009, PolarStar Airsoft has led the charge in developing the world’s most advanced HPA systems. Backed by PolarStar Engineering & Machine, an American manufacturing powerhouse, the company combines high-performance design with the craftsmanship of expert toolmakers. Their mission? Replace outdated AEG systems with reliable, tunable, and efficient HPA platforms that redefine the standard for serious players.

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Dominate the field with the PolarStar F2 V3 – your gateway to precision airsoft performance. Whether you’re clearing tight corners or holding long sightlines, this engine gives you the control, efficiency, and speed you need to outplay the opposition.