Polarstar FCU - Fire Control Unit, Rev. 3, Universal Condition:New Top Picatinny Rail on the

Top Picatinny Rail on the Front and Rear of the Handguard

Custom fabricated selector switch

Most typical HPA tank regulators output anywhere from 600-800 PSI

Fully assembled & KA Tech–tuned HPA rifle

Polarstar FCU - Fire Control Unit, Rev. 3, Universal Condition:New Top Picatinny Rail on theAn FCU (Fire Control Unit) is needed for all Polarstar rifles with the acception of the Polarstar Kythera. If buying this with a Polarstar rifle from KA Tech Airsoft it will come pre tuned for that specific rifle. If your buying this as a solo product and you would like it tuned for your rifle please fill out the contact form or leave a comment giving the following details, the more specific the better Which Polarstar Engine Ex. Polarstar Jack Hopup