PolarStar Fire Control Unit, Rev. 3, Universal Built in MCU

Meet the PolarStar Fire Control Unit Rev. 3 — a universal built-in MCU for PolarStar HPA systems, designed for airsoft players who demand precise, reliable control. It combines an LCD screen and joystick for intuitive navigation and supports both single- and dual-solenoid configurations, with MCU port compatibility for box magazines.

• Universal compatibility: Works with all PolarStar HPA systems, including both dual- and single-solenoid configurations.
• Integrated MCU: Built-in Motor Control Unit enables box magazine operation via the MCU port.
• LCD screen & joystick: Provides easy navigation through menus and precise adjustment of settings for optimal control.
• REV3 efficiency & size: Updated voltage regulators greatly improve energy efficiency and reduce the overall footprint.
• Compact footprint: 2.25" x 0.9" profile designed to fit inside an M4 buffer tube with a small 300mAh LiPo pack.
• Power & safety: Efficient regulators help stabilize performance across battery voltage and extend run time.

For players seeking streamlined performance, this FCU consolidates control into one compact unit, simplifying field setups, reducing cable clutter, and enabling precise tuning of dwell, voltage, and firing modes. The REV3's energy-efficient regulators extend battery life between charges, and the MCU port supports box-magazine throughput for rapid, continuous firing. Its universal compatibility means you can upgrade your existing PolarStar HPA system without swapping controllers, whether you run a single-solenoid or a high-demand dual-solenoid setup. The compact size makes it ideal for builds in tight spaces, like an M4 with a slim LiPo pack, while the clear LCD and joystick keep adjustments quick and accurate during matches or planning sessions.