Guns Modify 7003 T6 Aluminum CNC Speed Zero Bolt Carrier for Marui M4 GBB (Blue) 
CNC T6 Aluminum Construction (Lightweight) 
Suitable for Tokyo Marui M4 Series Airsoft Gas Blow Back GBB Rifle 
Ability to attach the added weight in its rear to increase felt recoil by the addition of more mass to increase inertial forces 

- Suitable for Marui M4 GBBR
- CNC machined T6 aluminum construction
- Adjustable steel weight at rear end
- 140 gram weight

Item Code: GM0249