JACK / F2 BV309A Bullet Valve T-Shirt that number is universal across

that number is universal across all engines* that use the numbered nozzle system

• UPF 50+ protection

If a more restrictive nozzle is needed to keep the muzzle velocity within field limits

The F2™ offset has the same performance and uses the same rear cylinder

With the PolarStar UGS™ (Universal Gas Stock) you can now get the performance advantage of a HPA system without needing to be tethered to a remote air rig and still retain the likeness and function of a traditional adjustable stock

JACK / F2 BV309A Bullet Valve T-Shirt that number is universal acrossThe BV309A Bullet Valve is the solenoid used in all current production F2 and JACK HPA systems and it is backwards compatible with all F2 and JACK systems previously made. Power lead is included with the valve and also available separately. (Power Lead part # 10000479)