NBS .223/5.56 Bolt Carrier Group - Black Nitride - 516446953

Technical Specs:

• Gas system: Direct Impingement

• Caliber: 5.56x45mm NATO/.223 Rem, .300 Blackout

• Finish: Salt Black Nitride

• Bolt: 9310 Alloy Steel (High Hardness)

• Carrier: 8620 Aircraft Grade Steel

• Extractor: Shot Peened and Case Hardened D2 Tool Steel

• Firing Pin: Mil-spec 8740 steel with hard chrome finish

• Gas Key: Mil-Spec w/ properly staked Grade-8 screws & Permatex No. 3 sealed

• Cam Pin: 8620 Steel w/ Black Nitride Finish

• Quality Control: MPI Inspected for QC