FG-Airsoft developed a CNC Aluminium Hop-Up Wheel for the GHK M4 GBBR... "Enhanced CNC aluminum hopup wheel for GHK M4 is more durable than the original plastic wheel. It gives a more smooth adjustment of the hopup effect (enhanced shape) and the position and adjustment direction is indicated all around the wheel."
A new release from FG-Airsoft that will surely interest the owners of the GHK G5 Gas Blowback Rifle... "Enhanced CNC stainless steel hopup wheel for GHK G5. It is more durable than the originall plastic wheel and with a smoother adjustment of the hopup effect (enhanced shape)."