FailZero M16 .223 / 5.56 Nickel Boron Bolt Carrier Group with Matte Finish

The FailZero AR-15 .223 / 5.56 M16 / M4 EXO Nickel Boron Bolt Carrier Group is a fully assembled drop-in BCG compatible with most standard AR-15 upper receivers. Featuring heavy-duty tool steel construction, this BCG boasts an EXO nickel boron coating that provides natural lubricity, extreme durability, and increased wear and corrosion resistance for long-lasting service you can depend on. Includes a precision-machined bolt and extractor, bolt carrier, cam pin, carrier key, and firing pin. Order