PolarStar Airsoft F1 HPA Electro-Pneumatic System with Full Size FCU for M4/M16

Specifications: Manufacturer: PolarStar Construction: Aluminum Alloy Compatibility: Most Version 2 M4 Gearboxes Overall Length: 4 inches Features: Machined aluminum alloy construction provides superior durability and lightweight design Tool-less design makes in the field maintenance simple and hassle free Delrin air nozzle that lightweight yet highly durable Can be used with batter packs between 7.4v and 1.08v (7.4v - 8.4v recommended) FCU allows for rate of fire, max semi-auto, and selector mode adjustments 2-9 round burst capability MAC manufactured custom solenoid makes the F1 system more compact and efficient Dual purpose flow control system allows for nozzle speed regulation and two-stage firing, increasing cyclic rate, and smoother chambering 5 moving parts offers extreme reliability and makes maintenance easy Compatible with most version 2 M4/M16 gearboxes Package Includes: 1x F1 Engine, 1x FCU, 1x Trigger Board, 1x Air Supply Line, 1x FCU Wiring Harness