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The Hopup Chamber M4A unit is built with an aluminum Rotary Dial Knob for fine hopup adjustments
It will automatically disconnect the battery
changes the Reticle Color from Blue or Red
Firefly Recoil Cylinder Valve for Marui M9A1 and compatible guns
Polarstar F2 - HPA Conversion Kit hicapa The Hopup Chamber M4A unitPolarstar F2 HPA Conversion Kit The F2 incorporates a new one piece, lightweight poppet valve design yet still operates on the same principle as the Fusion Engine poppet. This valve is able to operate at lower pressures and uses less air volume to function which optimizes air efficiency. A robust design allows for an operating pressure range of 45psi to 145psi which enables the F2 to achieve velocities from CQB to DMR while employing only one nozzle
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