Compatible With GHK M4 /MK18 /RIS /MK16 GBB Series!
Bolt carrier ONLY, loading nozzle(#M4-15) and guide(#M4-16) buy separate.
Bolt carrier  Black/Silver two colors opitional.
- For GHK M4 GBB
- Material : Aluminum Alloy CNC, Steel.

Product content:
   Aluminum CNC Bolt Carrier(M4-KIT-03-1) x1
   Reinforce Recoil Spring(M4-KIT-03-2) x1
   Aluminum CNC Buffer(M4-KIT-03-3) x1
- Improve of rate of fire(ROF).
- Improve the reaction speed of semi-auto, a must for competition shooting.