Nickel boron complete M16 Bolt Carrier Group.
-M16 Heavy duty bolt carrier
-Nickel boron coating
-8620 M16 carrier
-High Quality Firing Pin
This Bolt Carrier is made specifically for the AR-15/ M16 platform, this M16 bolt carrier is fully nickel boron coated inside and out. The bolt is made from 9310 steel, heat treated to Mil-Spec,carrier is 8620 steel, superior quality and coating as well.- gas key and bolt may come with nitrided part to help ensure longer life.