AntTech F2 Shim Kit

AntTech F2 Shim KitSimple 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 builds performance! Too much space = air leak, resulting in major FPS deviation and power loss. Too little space = over inserting BBs,

These pre-builds were tuned to work optimally at around 1

- "MP5" Length Nozzles will be too short to work with the Maxx MTW HopUp Chamber

Broader curvature of the feed track

The CO2 configuration comes with a different rail that allows it to accept our 12g or 33g CO2 Insertswhich makes it possible to use traditional Milspec buttstocks

resulting in major FPS deviation and power loss

this rear alignment spacer prevents the Retro Arms QC Spring Guide from pushing in and rotating itself out of the gearbox during operation and maintenance

This rear alignment spacer is intended to keep a Retro Arms VFC Spec Gearbox perfectly aligned inside of a VFC 416A5 Receiver

it is dependent on the tolerance stacking between the Gearbox Shell

This part's precision has drifted to the point of almost always failing to properly align the HopUp chamber with respect to the position of the gearbox

The stock cast metal feed block's have drifted further and further from their original dimensional specs over the years

it is highly encouraged to test different BB weights and PSI settings until you find the performance that best suits you

and in many cases are impossible to hold in place in the absence of a spring