- This Hop-up chamber unit features top notch air seal and is designed to provide the best possible bb flight control.
- Reinforced Metal Design
- Polished internal
- O-Ring Seal on Gearbox Side
- One-Piece Hopup unit.
Compatibility: M4, M16, M4A1, SR25, and other compatible Airsot AEG models that uses M4 Hopup units, One piece hop up.