Clovair Clover Airsoft Polarstar Jack HPA Engine Upgrade Kit (V3 AK) – Adjustable FPS

Overview

Clovair's Clover Airsoft Polarstar Jack HPA Engine Upgrade Kit for V3 AK brings programmable air pressure control to your airsoft replicas. The Jack handles velocity adjustment by changing input pressure, allowing a broad FPS range without changing nozzles. On a standard M4, FPS can range from below 280 to approximately 500 with a .20g BB, though exact figures vary with barrel length and other factors.

Designed for performance, the Jack's streamlined, lightweight design is built for field versatility. Longer barrels typically push max velocity higher, while shorter tubes can reduce it. The capacity to tune both velocity and rate of fire makes it a flexible option for different environments, from tight CQB spaces to longer-range skirmishes. The maximum sustained rate of fire in typical builds sits around 30 rounds per second, though this depends on operating pressure, magazine quality, and BB selection.

What’s in the kit and how it fits your setup

Included in the package are the Engine and FCU for straightforward programming of rate of fire and related parameters. The FCU makes it easier to dial in the ROF and safety features, while the engine governs the core air delivery. The kit is intentionally lightweight and compact, minimizing added weight on your receiver and preserving maneuverability.

• Easily adjustable FPS can be used for CQB and field use without swapping nozzles
• FCU included for quick programming of rate of fire and other parameters
• Extremely lightweight and compact design

Note: HPA components—tank, tank line, regulators, and Foster fittings—are sold separately. This kit ships with the Engine and FCU only. Professional installation is required; improper installation by a skilled technician can lead to suboptimal performance or damage to the system.

Practical use and considerations

For players who want consistent air delivery with flexible orchestration of velocity, the Jack offers a practical path to adjusting performance on the fly. Indoor halls and close-quarters arenas can benefit from lower FPS, while outdoor fields can take advantage of higher speeds—within terrain rules and safety guidelines. As always, confirm your equipment compatibility, local laws, and field policies before use, and ensure your build remains within safe operating practices.

• Maximum cyclic rate around 30 rounds per second in standard setups, depending on magazines and BBs
• Longer barrels generally raise the practical velocity ceiling, shorter barrels may lower it

With its focus on air efficiency and versatility, the Clover Airsoft Polarstar Jack HPA Engine Upgrade Kit stands as a thoughtful upgrade for dedicated players who want to tailor their performance without swapping components. It’s a tool for experimentation and refinement, not a guaranteed outcome, and it should be installed by a qualified technician.