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Retro Arms

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

Regular price
$39.00 USD
Regular price
Sale price
$39.00 USD


  • 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