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FailZero EXO 5.56/.223 M16 Bolt Carrier Group – Black Nitride
FailZero EXO 9mm Bolt Carrier Group Nickel Boron
FailZero EXO 9mm Bolt Carrier Group Black Nitride
FailZero EXO 5.56/.223 M16 Bolt Carrier Group – Nickel Boron
Fail Zero Lightweight M16 Bolt Carrier Group – No Hammer