FailZero M16/M4 Bolt Carrier Group BCG No Hammer EXO FZ009-FZM164-01-NH. These Bolt Carrier Groups made by FailZero come fully-assembled for easy drop-in installation on most Mil-Spec upper receivers. All essential components of the FailZero M16/M4...
FailZero M16/M4 Bolt Carrier Group BCG No Hammer EXO FZ009-FZM164-01-NH. These Bolt Carrier Groups made by FailZero come fully-assembled for easy drop-in installation on most Mil-Spec upper receivers. All essential components of the FailZero M16/M4...