F LBE Unlimited 5.56 M16 / AR-15 Bolt Carrier Group - Nickel Boron $169.99 LBM16BCG-NIB show more like this Calculated in Cart Primary Arms F LBE Unlimited AR-15 Complete Bolt Carrier Group 5.56mm NATO Nickel Boron M16BCG-NIB $229.97 M16BCG-NIB show more like this $10 Flat for Firearms Cheaper Than Dirt