Shop › SANTAN AR15 ENHNCD BCG 556 NTRD BLK SANTAN AR15 ENHNCD BCG 556 NTRD BLK $200.00 San Tan Tactical Enhanced Bolt Carrier Group, Black Nitride Finish, 556 NATO STT-Enhanced BCG 5.56 Quantity: Add To Cart Added! San Tan Tactical Enhanced Bolt Carrier Group, Black Nitride Finish, 556 NATO STT-Enhanced BCG 5.56