The gold version of the Spear Arms CNC Steel Bolt Carrier for the GHK M4 GBB Rifle is available at RedWolf Airsoft... "Spear Arms CNC Steel Bolt Carrier for the GHK M4 GBBR is incredibly solid robust. The lighter weight doesn't kick as much meaning the rate of fire will increase a fair bit. You will even get more shots off per gas refill if your magazine!"
