PolarStar Fusion HPA Engine™ Drop-In Kit - V2 Gen3 M4/M16

PolarStar Fusion Engine™ Drop-In Kit

Maximum LMG Suppression. Unmatched Dual-Solenoid Firepower. Instant Drop-In Precision.

Turn your support weapon into an unstoppable force of continuous cover fire with the PolarStar Fusion Engine HPA Conversion System. Engineered specifically for heavy machine gun platforms, the Fusion Engine drops directly into your LMG receiver, replacing delicate, high-stress mechanical gearboxes with PolarStar’s legendary dual-solenoid electro-pneumatic technology.

Built for sustained, high-volume fire without the mechanical wear or heat build-up that destroys standard AEG gearboxes, the Fusion Engine allows support gunners to hold down choke points, suppress entire lanes, and maintain laser-flat trajectory downrange. Featuring complete FCU programmability, you can dial in your exact Rate of Fire and velocity to match your squad's rules of engagement.

Variant Options Available

M249 SAW Platform:

Engineered specifically for A&K, Classic Army, Featherweight, and standard M249 SAW/MK46/Para machine gun receivers.

M240B Platform:

Custom-tailored geometry for A&K/Matrix M240B medium machine gun platforms.

Key Features

• Drop-In Machined Aluminium Chassis:Replaces the stock cast alloy LMG gearbox with a rugged CNC-machined aluminium housing designed to handle heavy field use.
• Dual-Solenoid High-Volume System:Independent poppet valve and nozzle timing yield extreme consistency, instant trigger response, and reliable feeding on box magazines.
• Full FCU Programmability:The included Fire Control Unit (FCU) with LCD screen lets you fine-tune Rate of Fire (1–60+ RPS), Nozzle Dwell, and Burst/Full-Auto firing profiles on the fly.
• Tool-less Velocity Adjustment:Adjust your FPS instantly by changing your HPA regulator pressure (45–145 PSI) or swapping color-coded poppet valves/nozzles.
• Closed-Bolt Consistency:Delivers match-grade shot-to-shot velocity consistency, maximizing accuracy and range during sustained suppression bursts.
• Zero Mechanical Wear:Eliminates stripped gears, cracked shell casings, and piston stripping associated with high-ROF support weapon gearboxes.

Technical Specifications