Retro Arms CNC Aluminum Rotary Hop-up Unit for V2 M4 AEG
$37.99
Features
- Rotary design allows for precise and easy adjustment
- R-hop "TDC" top down center 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
