HPA DROP-IN KIT - Full HPA Universal Drop‑In Kit for Gearbox V2 (M4 Rear‑Wired)

The HP‑R STORM System is a universal, electro‑pneumatic HPA engine designed for Version 2 gearboxes with M4‑style rear wiring. Built for players who want the precision, consistency and responsiveness of HPA without the complexity of full custom builds, the STORM System delivers a clean drop‑in upgrade with digital control and an adjustable nozzle for perfect tuning.

Powered exclusively by an 11.1V LiPo, the HP‑R uses a fast‑cycling solenoid and a dedicated FCU with LCD screen, giving you full control over firing modes, valve timing and performance settings.

Key Features

• Electro‑pneumatic HPA system for V2 gearboxes
• Designed for M4‑type replicas with rear wiring
• Adjustable nozzle for precise feeding and compatibility
• Digital FCU with LCD screen for easy programming
• Adjustable firing modes: Semi, Full‑Auto, Binary
• Adjustable solenoid valve opening time
• Powered by 11.1V LiPo ONLY (battery not included)
• Simple installation with included shims and mounting plate

Included in the Kit

• Adjustable nozzle + 4 shims
• Trigger board riser plate
• FCU (Fire Control Unit)
• LCD programming screen
• Flexible macro line
• Connection cable (FCU ↔ trigger board)

Why It’s a Strong Upgrade

The HP‑R STORM System brings HPA performance to standard V2 platforms without requiring a full gearbox replacement. With digital tuning, consistent air delivery and a user‑friendly setup, it’s ideal for players who want to step into HPA with a system that’s accessible, reliable and highly adjustable.