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

Get smooth and reliable function with your rifle at the range and upgrade it with the FailZero® M16 .223 / 5.56 Nickel Boron Bolt Carrier Group (BCG) with Hammer. 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. This BCG includes a hammer so you can upgrade your firing control unit to improve its function with your rifle. This fully assembled drop-in BCG is compatible with most standard AR-15 upper receivers. Includes a precision-machined bolt and extractor, bolt carrier, cam pin, carrier key, and firing pin.