FailZero M16/M4 BCG (No Hammer) – AR-15/M16 Bolt Carrier Group

The FailZero M16/M4 Bolt Carrier Group delivers reliable cycling for AR-15 and M16 pattern rifles without the included hammer, making it ideal for builders who already have fire control components or prefer to source them separately.

• Part Type: Bolt Carrier Group (No Hammer)
• Compatible Firearms: AR-15, M16, M4, 5.56 NATO/.223 Wylde chambered rifles
• Material: Carpenter 158 steel bolt, 8620 steel carrier
• Finish: FailZero EXO Nickel Boron coating
• Testing: MPI and HPT tested
• Installation: Drop-in for mil-spec AR-15 upper receivers
• Includes: Bolt carrier, bolt assembly, cam pin, firing pin, gas key (staked), retaining pin