MANUFACTURER: Wilson Combat FAMILY: Accessories MODEL: Bolt Carrier Assembly TYPE: Accessory-Bolts ITEM GROUP: Rifle Accessories CALIBER/GAUGE: 223 Rem | 5.56 NATO FINISH: Black Nitride FINISH TYPE: Black SHIPPING WEIGHT: 0.9 lbs. MFG MODEL NO: TR-BCA-SBN-556 UPC: 810025500757