Simple and brilliant, this shim kit uses the cylinder window and front face your gearbox to lock and fine tune the position of your Polarstar F2.
HPA engines that shift back and forth in the gearbox shell will yield inconsistent and low FPS. Even .1mm of space between your nozzle and bucking can make or break your build’s performance! Too much space = air leak, resulting in major FPS deviation and power loss. Too little space = over inserting BBs, resulting in FPS deviation and inaccuracies.
Now you can set your engine in the optimal position for your given shell, nozzle length, and hop up/ barrel assembly.
Lastly, this method is compatible with all gearbox shells! (Even the KAC Stoner LMG)
