Maxx Model CNC Aluminum Hop-up Unit for M4 (MI-PRO)

Maxx Model CNC Aluminum Hop-up Unit for M4 (MI-PRO)

  • $95.69
    Unit price per 
Shipping calculated at checkout.


  • Machined from a solid aircraft aluminum block with tight tolerances to provide better accuracy, consistency, and durability
  • Improved accuracy and ensure consistent air seal for ICS CXP/CS4/EBB (include old models) M4/M16 AEG series
  • Precision rotary dial design for fine hopup adjustments
  • Re-engineered the hopup levers and concave nubs to work best with R-hop, Flat-Hop and Standard-Hop to keep the BBs shooting straight and accurate on every single shot
  • Removable Brass Threaded Slot Pin for setup and maintenance
  • Compatible with ICS stock nozzle, or nozzle length from 21.00mm to 21.25mm
  • Fully compatible with stock bucking and most aftermarket soft and hard rubber bucking without losing FPS or dropping BBs
  • Specially designed with BB Latching System to prevent dropping BBs after removing the magazine, manually opened to release BBs from inside hopup chamber by hand
  • Compatible with ICS CXP/CS4/EBB (include old models) M4/M16 AEG series
  • Overall Length: 51mm
    Overall Height: 38.5mm
    Hub Outer Diameter (to fit into Outer Barrel): min 12mm
    Hub Inner Diameter (to fit Nozzle): max 8.3mm
    Feeder Outer Diameter (to fit magazine): min 9.25mm
    Feeder Length (to fit magazine): max 6.25mm
  • Hopup Kit Includes:
  • 1 x CNC Aluminum Hopup Chamber MI Pro (with BB Latching System) unit
  • 2 x Strong Clear Vinyl Cover
  • 1 x CNC Aluminum Standard-Hop Arm
  • 1 x CNC Aluminum R-Hop Arm
  • 1 x Silicone Rubber Standard-Hop Nub Damper
  • 1 x Silicone Rubber R-Hop Nub Damper
  • 1 x CNC Aluminum 4.5mm length Precision R-Hop Concave Nub
  • 1 x CNC Aluminum 6mm length Precision R-Hop Concave Nub
  • 1 x CNC Brass Threaded Slot Pin
  • 1 x CNC Delrin Locking C-Clip
  • 1 x CNC Barrel Brass Spacer
  • 1 x Brass Spacer Holder Oring
  • 3 x Steel Compression Spring

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