FailZero

  FailZero M16/4 Full-Auto BCG - No Hammer - Nickel Boron EXO This Bolt Carrier Group (BCG) comes fully assembled and ready to drop into most mil spec M16, M4 or AR15 upper receivers...

  FailZero M16/4 Full-Auto BCG - No Hammer - Black Nickel Boron EXO This BCG is perfect for shooters looking for a tactical advantage resulting from the non-reflective properties. The carrier...

  FailZero AR15 Semi-Auto BCG - No Hammer - Black Nickel Boron EXO This BCG is perfect for shooters looking for a tactical advantage resulting from the non-reflective properties. The carrier...