Maxx Model CNC Hop-Up Chamber MGW for MTWCNC Aluminium Hop up Chamber MGW unit is precisely machined to perform accurately and consistently on HPA MTW Milspec, Forged, Billet and MTW 9 series. The Hop up Chamber MGW unit is built with an aluminium Rotary Dial Knob for fine hop up adjustments, the precision Hop up Lever and Bucking Nubs to perform best and keep the BB shooting accurately and consistently on every single shot. The Hop up Chamber MGW unit is designed to accept the HPA MTW