FailZero AR-15 .223 / 5.56 EXO Nickel Boron Bolt Carrier Group with Hammer

The FailZero® AR-15 .223 / 5.56 EXO Nickel Boron Bolt Carrier Group with Hammer includes a hammer so you can upgrade your firing control unit for improved function with your rifle. This fully assembled drop-in BCG is 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.