A Plus Airsoft GBB AR Series Hop Up Chamber for GHK
CNC Aluminum Construction
Suitable GHK M4 Series Airsoft Gas Blow Back GBB Rifle
Compatible with VSR-10 type inner barrels and hop buckings ( with side tab removed )

Item also fits G&P, Western Arms, Inokatsu AR series, silver part will need to be removed to fit these systems, Western arms systems will need to use negative pressure bolt carrier , hopup system takes standard Tokyo Marui vsr-10 type buckings and inner barrel

As always, upgrading rifle require necessary skill & technique to dissemble the gearbox, consult expertise if needed