CNC Aluminum Hopup Chamber M4A - PRO
This CNC Aluminum Hopup Chamber M4A Pro unit is designed for precise hopup adjustments and compatibility with various M4/M16 AEG series.
- The Hopup Chamber M4A unit is designed to accept 21.00mm to 21.25mm nozzle length.
- The unit is claimed to keep BB shooting accurately and consistently on every single shot.