CMC Triggers 81631 Bolt Carrier Group Enhanced 223 Rem,5.56x45mm NATO,300 Blackout Black Nitride 8620 Steel AR-15 $199.00
Spikes ST5BG03 Bolt Carrier Group 223 Rem,5.56x45mm NATO Nickel Boron Steel AR-15, M16 Full Auto $202.50
Sons Of Liberty Gun Works SOLGWBCG556 Bolt Carrier Group 5.56x45mm NATO, Black Phosphate Carpenter 158, Full-Auto Rated, Fits AR-15 $201.88