Spikes ST5BG01 Bolt Carrier Group 223 Rem,5.56x45mm NATO Black Phosphate Steel AR-15, M16 Full Auto $134.96
Spikes ST5BG03 Bolt Carrier Group 223 Rem,5.56x45mm NATO Nickel Boron Steel AR-15, M16 Full Auto $202.50
HM Defense HMBBCGAR15 HMB Bolt Carrier Group 223 Rem,5.56 NATO Black Nitride 9310 Steel AR-15 Drop In $152.42