REAPERs Airsoft checks out the Begadi MPAX CNC Hop-Up For CYMA MP5 in this comprehensive review. The mpaX unit is completely CNC manufactured and works in the so-called TDC system, in which the inserted tensioner is moved onto the HopUp rubber via a guide.This creates a constant and evenly distributed pressure on the rubber patch. Commercially available AEG rubbers can still be used. They recommend combining it with our Begadi PRO HopUp rubbers (FLY5, SHP5 or MAG5, MHP5).