make / manufacturer: EMG Polarstar model name / number: Jack For sale is a limited edition EMG Polarstar Jack. It comes with working charging handle and bolt release, hair trigger perfect for speedsoft, full metal construction, and skull-molded lower receiver. Other upgrades include: Prowin Hop Prometheus Purple Hop up Bucking Polarstar Jack - hits 325 fps at 80 psi Battery, tank, and regulator not included TAGS: airsoft m4 cqb sbr speedsoft rifle carbine emg polarstar fusion engine jack wolverine smp inferno