AirsoftPro M4 CNC Hop-Up Unit & Delta Ring Spanner

Code: 4033
  • CNC Machined
  • Hop Rubber Included
  • Full Assembly Kit & Tools

A very highly quality hop up unit that replaces most standard 3 gear rotary to a single rotary collar, similar to that of a G36 hop-up unit. This single rotary collar allows for finer and more precise hop adjustments to be made.

Full description


The whole unit requires quite an in-depth disassembly of the front end of your M4 for a professional installation. Check YouTube for an installation guide on this hop-up unit. You get absolutely everything you need from unit to rubber and even the tools to correctly fit. The unit improves your range and accuracy thanks to its clever design and included nub that with the right FPS behind each shot, can pretty much lift any BB weight.


  • Precision CNC engineering
  • Original design from AirsoftPro, Czech Republic
  • Adjustable grub screw hop spacer
  • Easy installation!
  • Improved range and accuracy
  • Everyone who works at Patrol Base loves this hop unit!

Package Includes:

  • 1 x CNC Hop Unit
  • 1 x Retention / Seal O-ring
  • 1 x Polymer hop arm
  • 1 x Polymer barrel C-clip
  • 1 x Hop arm pin
  • 1 x Adjustable hop spacer grub screw
  • 1 x Precision adjustable hop wheel & wishbone retention



Parts & Accessories Type
Tools and Chronographs
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Over 18
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Weight and Dimension

Weight KG Icon
Weight (KG)
Approx. 0.06kg


Colour Wheel Greyscale
Item Colour
Construction Icon
CNC Machined Aluminium
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