BESTA Airsoft does a review of the ASG Scorpion Evo CNC Hop-Up. Made by ASG itself, it is design to give of up to 20% in improvement in terms of accuracy and range. It is compatible with hop-up rubbers and BB weights available in the market and can be used on both the AEG and HPA versions of the Scorpion EVO... "We tested the new CNC Hop Up Chamber for the Scorpion Evo. A one piece aluminium hop up that will enhance your platform."