Faxon Firearms FF556BCGCNITRIDE Bolt Carrier Group M16 5.56x45mm NATO Salt Bath Nitride 9310 Steel For Rifle $141.99
Faxon Firearms FF308BCGCNITRIDE02 Bolt Carrier Group Gen2 6.5 Creedmoor/308 Win/8.6 Blackout, Salt Bath Nitride 9310 Steel $192.72