PolarStar F2 HPA Engine for V2 Gearbox Airsoft Rifles HPA Hop-Up: Yes

Hop-Up: Yes

They also automatically stop charging at a full charge

The collapsible/foldable stock features a 6 position length of pull and a 2 position cheek riser

FIRING MODES: SINGLE SHOT

PolarStar F2 HPA Engine for V2 Gearbox Airsoft Rifles HPA Hop-Up: YesWhat is F2? F2 is essentially a Mini Fusion Engine. It offers the same adjustability and performance as the Fusion Engine in a cylinder sized package. Patented Dual Solenoid Design The dual solenoid design of the F2 provides the same functionality as the legendary Fusion Engine but in a more compact, efficient and flexible design. Dual solenoids allow for the nozzle and the poppet valve to be adjusted independently of each other for unparalleled