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Brand: Gear Stock

CNC Aluminum Hopup Chamber MI Sport (with BB Catching System) unit is precisely made to improve accuracy and ensure consistent air seal for ICS CXP/CS4/EBB (include old models) M4/M16 AEG series.The Hopup Chamber MI unit has a precision rotary dial design for fine hopup adjustments, also re-engineered the hopup levers and concave nubs to work best with R-hop and Standard-Hop to keep the BBs shooting straight and accurate on every single shot.The Hopup Chamber MI unit is designed to accept ICS stock nozzle, or nozzle length from 21.00mm to 21.25mm, and also fully compatible with stock bucking and most aftermarket soft and hard rubber bucking without losing FPS or dropping BBs.


  • Material: Aluminum 6061
  • Hub Outer Diameter (to fit into Gear Box): min 11.5mm - max 12mm
  • Hub Outer Diameter (to fit into Outer Barrel): min 12mm.
  • Overall Length: 51mm
  • Overall Height: 38.5mm
  • Compatible with ICS CXP/CS4/EBB (include old models) M4/M16 AEG series

  • Hopup unit may require assembling


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