Polarstar Fire Control Unit, Rev. 3, Universal Flashhiders and Outer Barrels Compatible when used with the

Compatible when used with the Valken SMG Magazine Adapter

The windy wheel on these unique highcaps doesn't have to be wound as much

players can expect faster trigger responses and extended battery life

Fully adjustable to fit all kids and adult sizes up to large adults

1v with a mosfet before ordering this

Polarstar Fire Control Unit, Rev. 3, Universal Flashhiders and Outer Barrels Compatible when used with theThe REV3 FCU follows the classic design of our very first FCU and it is considered to be the finest fire control units on the market. Since it is equipped with an LCD screen and joystick you are able to easily scroll through menus and precisely adjust settings for the utmost control over the system. This FCU is also universally compatible with all PolarStar HPA systems including both dual and single solenoid systems. This latest REV3 model features