Retro Arms CNC Aluminum Rotary Hop-up Unit for V2 M4 AEG

$39.00

 Features

  • Rotary design allows for precise and easy adjustment
  • R-hop TDC nub / arm + standard hop-up arm included 
  • CNC machined aluminum 
  • BB retention with O-ring (optional)
  • Threaded collet nut to eliminate barrel torsion and vibration