quad-rail hand guard

this deluxe edition comes with medium and large interchangeable backstraps

as well as shotgun shells

Double O-Ring design for better air sealing

This new version features an upgraded Avalon ECS gearbox

F2™ HPA Conversion Kit M4 Polarstar quad-rail hand guardWinner of the "Best HPA Engine" in the 9th Airsoft Players Choice Awards, 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 control over both the loading time and air volume used. Additionally, this makes it possible to change the