Polarstar F2 HPA Engine for Version 3 AK Airsoft Rifles

With the F2, you’re getting Polarstar’s proven fusion engine tech in a tiny, high-strength alloy housing. It features dual solenoids, allowing the nozzle and poppet to move independently. This is a game-changer for tuning; whether you prefer open or closed-bolt firing, the F2 lets you dial in your AK for superior accuracy and more consistent groupings.

The F2 uses a spring-loaded nozzle to keep your loading force identical for every shot, which is the secret to consistent feeding. It’s also built with a one-piece poppet valve that lets you run at lower pressures, so you get more shots out of every tank without sacrificing power. With an adjustable operating range of 45–145 PSI, you can achieve a massive velocity range of 205–500 FPS, allowing you to transition from a high-speed CQB build to a long-range DMR without swapping internal parts.

Tuning is handled by the included F2 FCU and LCD screen, making it easy to program dwell and fire rates on the fly. Installation is straightforward for most version 3 gearboxes, making this Polarstar unit the ultimate internal upgrade for competitive players. The package comes complete with the engine, FCU, wire harness, and a V3-specific trigger board, allowing you to retain your favorite hop-up and barrel setup while gaining the legendary reliability of HPA.

Features:

• Lightweight compact design
• Dual solenoid system
• Open and closed bolt firing
• LCD-equipped F2 FCU
• Spring-loaded nozzle
• Low-pressure poppet valve
• Rapid adjustable velocity