F FailZero M16/M4 Bolt Carrier Group BCG, No Hammer, EXO, FZ009-FZM164-01-NH $153.99 FZ009FZM16401NH show more like this Free Shipping on most orders over $49 Optics Planet F FailZero M16 / AR-15 EXO Coated Bolt Carrier Group $169.99 009-FZM164-01-NH show more like this Calculated in Cart Primary Arms