Lancer Tactical CA-631 M4 Hop-Up Unit, CNC Aluminum

M4 / M16 CNC Machined Airsoft AEG Hop-Up Chamber Unit provides a better air seal than stock AEG hop up units, and feeds flawlessly with a variety of magazines.  Machined from a solid piece of EASTON 7075 aluminum, this hop-up unit is much stronger than most other hop-up chambers on the market. 

Features:
- Made from EASTON 7075 aluminum
- CNC machined
- Improved air seal
- Anodized finish
- Includes chamber parts
- Includes bucking

Specifications:
Construction:  CNC Aluminum
Compatibility:  Fits M4 / M16 Style AEGs