Nitride 6.8 SPC Bolt Carrier Group
The carrier is made from 8620 steel and includes an installed and properly staked gas key.
The Bolt is made from 9310 steel
There are full auto bolt carriers and are legal for use in your semi auto AR15.
The QPQ Nitride process makes these bolt carriers very easy to clean, resist corrosion, requires less lubrication and increases wear resistance and decreases friction.